An annex room is an enclosed extension that zips to the base of a rooftop tent and drops to the ground, adding floor-level space for changing, gear storage, cooking shelter, or extra sleeping. Most have a waterproof fabric body, a removable waterproof floor, mesh insect panels, and zippered doors that stand on their own poles.
Are they worth it? For most families and overlanders, yes, and the reason is simpler than the spec sheets make it sound. A rooftop tent is a sleeping platform with a ladder and a zipper door. An annex turns it into a basecamp you can stand up in when it rains, cook in when the mosquitoes are bad, and keep muddy boots out of the bed. If you camp solo in fair weather, you can probably skip it. If you have kids, a dog, or cook outside every night, you will notice the difference within two trips.
We compared 10 rooftop tent annex rooms across Smittybilt, ARB, Overland Vehicle Systems, Naturnest, Tuff Stuff, TOPOAK, and Body Armor 4×4. The honest wrinkle is that only five of these listings have any customer reviews at all, and two of those have a single review, so we leaned on published specifications, floor materials, attachment methods, and warranty terms wherever owner feedback was thin. Every product below fits one specific parent tent and almost nothing else, which is the first thing to sort out before you care about fabric denier.
If you have not picked the tent yet, start with our rooftop tent picks for overlanding and our rooftop tents rated for SUVs, then come back here. If your tent is already chosen, read on. We will tell you which annex matches it, what the floor is actually like, and where the deal-breakers are.
Table of Contents
Top 3 Picks for the Best Annex Rooms for Rooftop Tents (October 2026)
Smittybilt 2688 GEN2 XL Annex
- Fits Smittybilt GEN2 Overlander XL
- Removable zippered floor
- 4 windows and 4 pockets
ARB 804100 Simpson III Annex
- Fits ARB Simpson III
- Two rooms and 4-person capacity
- 13 lb carry weight
OVS TMBK Annex with PVC Floor
- Fits the OVS TMBK tent
- Removable 1000g PVC floor
- Four doors and mesh panels
The Smittybilt wins on evidence. Every one of its 20 owner reviews is a five-star, and the praise is consistent: the zipper attachment takes minutes, the grey fabric matches the parent tent, and the removable floor keeps mud out. The ARB Simpson III annex is the one to look at if you want the most established name in 4×4 accessories behind it, but its 3.6 average comes from a polarized split where owners complain about a missing floor and spindly supplied pegs. The OVS TMBK annex is the most fully specified for the money, including a genuinely removable heavy PVC floor and four doors, though a single review is all the owner feedback it has.
All 10 Rooftop Tent Annex Rooms Compared in 2026
| Product | Specifications | Action |
|---|---|---|
| Smittybilt 2688 GEN2 XL Overland Tent Annex |
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Check Latest Price |
| ARB 804100 Simpson III Annex |
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Check Latest Price |
| OVS TMBK Annex with PVC Floor |
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Check Latest Price |
 OVS XD Sherpa S4S Annex Room |
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Check Latest Price |
 Naturnest Sirius 1 Plus Annex Room |
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Check Latest Price |
 OVS HD Bushveld 2 Annex Room |
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Check Latest Price |
 Tuff Stuff Delta Overland and Trailhead Annex |
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Check Latest Price |
 Tuff Stuff Alpha II Annex Room |
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Check Latest Price |
 TOPOAK Vision Annex Room 75 inch |
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Check Latest Price |
 Body Armor 4×4 Sky Ridge Pike 3 Annex |
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Check Latest Price |
1. Smittybilt 2688 GEN2 XL Overland Tent Annex – The One Owners Never Fault
Smittybilt 2688 GEN2 XL Overland Tent Annex
Fits GEN2 Overlander XL part 2683
Removable zippered floor
4 windows, 4 pockets
22 lb
Pros
- All 20 owner reviews are 5 star
- Heavy-duty zipper attachment takes minutes
- Removable zippered floor included
- Waterproof polyester and polyurethane build
- Grey fabric matches the parent tent
Cons
- Fits only the Smittybilt GEN2 Overlander XL part 2683
- 22 lb is heavy for a removable add-on
- One door and four windows limit airflow
This is the annex with the most owner history in the group, and that history is unusually clean. All 20 reviews are five-star, which is rare for a niche accessory. Owners describe the same thing over and over: it zips to the GEN2 Overlander XL in minutes, the grey fabric is a close visual match to the tent, and the removable zippered floor is what makes it useful rather than decorative.
The floor is the reason to keep this one. It is a heavy-duty zippered liner, not a thin groundsheet, so muddy boots and a wet dog can live in the annex overnight without migrating into the sleeping area above. Two owners describe using it as a standing changing space and a gear locker, which is the most common use case for any annex we looked at.
Two things to know before you order. First, compatibility is absolute: this is built for part number 2683, the GEN2 Overlander XL, and nothing else. Second, the published size figures on the listing disagree with each other, so do not measure your setup off the spec page. Owners who bought it for the right part number report no fit issues at all.
One door and four windows is a modest amount of ventilation for a fully enclosed space, so expect condensation on humid nights. Owners running a stove inside should keep the door cracked and a fan moving air, which we cover further in the buying guide.
What the floor is actually like in cold weather
The removable floor is a liner, not insulation. In cold conditions you still want a foam mat, an insulated pad, or a rug underneath you, and owners say the same thing: the floor keeps water and mud out, it does not keep heat in. The benefit is that you can hose the whole floor down before folding it away, which is the practical reason to pick a zippered removable floor over a fixed one.
Four interior pockets mean the small gear stays off the floor and out of the walking area, which matters more in an 8-foot-wide space than it sounds like it does.
Where this one falls short
At 22 lb, this is one of the heavier units here, and it is dead weight whenever you are not using it. On a long trip where the annex stays packed, that is a real cost in fuel and in storage space behind the seats.
The single door is the other limit. A family of four changing in an 8-foot-wide room with one zip opening is a queue, and cross-ventilation through mesh panels is limited. If you cook inside regularly, plan on leaving the door open whenever the weather allows.
2. ARB 804100 Simpson III Annex and Changing Room – Established Hardware, Missing Floor
ARB 804100 Simpson III Brown Rooftop Tent Annex/Changing Room
Fits ARB Simpson III
Two rooms, 4-person capacity
13 lb
Two-year warranty
Pros
- Heavy-duty hardware and smooth-running zippers
- Light carry weight at 13 lb
- Sized for four as a changing or living space
- Two-year warranty
- Handles storms without penetration per owners
Cons
- Does not include a floor according to owners
- Supplied stakes spin and let guylines release
- Instructions are thin so a second person helps
It is the one most owners describe as physically well made. Reviews mention heavy-duty hardware and zippers that run smoothly, and several owners say it held off storms without rain getting in. At 13 lb it is the lightest of the ten we covered, which matters if your rack and payload are already working hard.
It is listed as a two-room space with four-person capacity, and that is a lot of room for a changing space. Owners use it that way, and it works well as a sheltered spot for a portable toilet or a shower if you hang a liner inside.
Now the part that drags the score down. The 3.6 average comes from a split that runs about two-thirds five-star and one-third one-star, which is a wide gap. On the critical side, the most repeated complaint is that no floor is included, and the second is that the supplied stakes have a round cross-section, spin in the ground, and let guylines release in wind.
The instructions are also thin enough that owners recommend a second pair of hands. If you are setting up in wind, that is not a minor detail. The listed dimensions also disagree between the size field and the item dimensions, so treat the footprint as approximate and measure your own setup.
Do you need to add a floor yourself
If you buy this one, plan on adding a groundsheet. Owners who used it as a changing room did fine without one, but anyone trying to sleep or store gear on the ground will hit bare soil, damp, and mud. This is the single most common complaint in the reviews, and it is the reason this annex does not take our top slot despite a strong brand and good hardware.
Replace the supplied stakes before your first windy night. Owners with round-cross-section pegs reported guylines releasing, and that is a fix you can make in a hardware store for the cost of a few extra stakes.
Who should pass on this one
Pass if you plan to sleep in the annex or use it as a gear locker, because the missing floor plus the light fabric is a poor combination for that. Pass if you are camping solo, because the four-person capacity is wasted on one person and the same money buys a smaller, fully floored option.
Consider it if you only want a bug-proof, weatherproof changing room beside the vehicle and you keep weight and bulk low. In that specific role it does its job well.
3. Overland Vehicle Systems TMBK Annex – The Most Features Per Dollar
Overland Vehicle Systems LD TMBK Roof Top Tent Annex Green Base with Black Floor & Travel Cover – 420D Polyester Oxford Waterproof Material -1000g PVC Based Floor
Fits the OVS TMBK tent
Removable 1000g PVC floor
Four doors with mesh panels
15 lb
Pros
- 420D polyester oxford body with a 1000g PVC floor
- Floor detaches completely for cleaning and packing
- Breathable fade-resistant mesh on doors and windows
- Four doors for genuinely good ventilation
- Four-year warranty and a storage bag
Cons
- Only one customer review exists
- Fits only the OVS TMBK tent
- Listed floor width and length do not match the item dimensions
This is the most fully specified annex in the group on paper, and the floor is the reason. It is a 1000g PVC floor that detaches completely, which is a heavier and more durable floor than most of the fabric floors here and the easiest one to clean. Owners of comparable OVS products like that you can hose it off and fold it separately.
Four doors is a genuinely unusual number. In a warm climate that is the difference between a stuffy box and a room you can cross-ventilate, and the 120g fade-resistant mesh on the doors and windows adds insect protection while still moving air. The roll-up window covers use a hook-and-lock system, so you can leave mesh exposed in good weather and cover it when rain comes sideways.
It attaches to the TMBK roof top tent with a quick heavy-duty zipper, uses aluminium or fiberglass poles in sleeves, and rolls up into a bundle with a storage bag included. The four-year warranty is the second longest published in this group.
The catch is evidence. There is exactly one customer review on this listing, and its five stars tell you very little. Everything above comes from the manufacturer listing, so treat it as unverified until owners report back. The floor width and length in the spec fields also disagree with the overall item dimensions, so measure your own tent before you commit.
How the ventilation holds up in practice
Four doors and mesh panels on every opening means you can create a cross-breeze in seconds, which is the single biggest driver of condensation inside an enclosed annex. On a still, humid night nothing helps, but on any moving air this one clears faster than anything else in the lineup.
The hook-and-lock window covers are a real convenience. Rolling and re-sealing mesh in a rainstorm is unpleasant; a cover you roll down and click is something you will actually do.
Where this one falls short
Fifteen pounds is fine, but the 1000g PVC floor is bulk. This is not an annex you will leave behind on a long trip, so budget rack space and packing volume rather than just weight.
One review means no long-term durability evidence, and a four-year warranty is a promise, not a track record. If your TMBK purchase is a considered one, read the fabric and floor claims as provisional until owners fill in the gaps.
4. Overland Vehicle Systems XD Sherpa S4S Annex – Floored, but Almost Undocumented
Overland Vehicle Systems 18009811: Xd Sherpa S4S – Annex Room with Floor, Black Body & Grey Trim
Fits the XD Sherpa S4S
Floor included
Easy setup
Black body, grey trim
Pros
- Floor is included
- Black body with grey trim matches the Sherpa S4S styling
- Marketed for easy installation
- Designed for the XD Sherpa S4S specifically
Cons
- The only customer review is a 1-star rating
- No weight
- dimensions
- fabric rating or pole details published
- Fits only the XD Sherpa S4S
We are including this one because it is a real option for Sherpa S4S owners, not because the listing inspires confidence. The headline feature is right: the floor is included, which puts it ahead of the ARB annex, and the black body with grey trim is designed to coordinate with the parent tent.
Beyond that there is almost nothing to evaluate. There is no published weight, no dimensions, no fabric denier, no pole specification, and no door or window count. The listing is marked for easy setup, which tells you nothing about how long that takes in wind.
The single customer review is a one-star rating. That is not enough to characterize what owners think, but it is enough to say that the first recorded owner was not happy. We would not treat that as a verdict on the product, and we would not ignore it either.
If you own a Sherpa S4S, this is one of the few annex options published for it, and the included floor is genuinely useful. If you are still choosing a tent, a listing this thin is a reason to look at a different brand instead.
What the included floor means for you
A floor means you have a dry, separated surface for boots, a duffel, or a dog bed, and it means you can use the space for something other than a changing cubicle. That is a bigger practical gain than most buyers expect from a listing that looks minimal on paper.
What it does not tell you is whether the floor is PVC or bare polyester, which is the difference between a floor you can wash and one you cannot.
Who should skip this listing
Skip it if you are buying without the tent already in hand, because there is no specification set to compare against competitors. Skip it if you plan to camp in sustained rain, since no weather-resistance figure is published for either the body or the floor.
Also skip it if cold-ground comfort is your priority. With no floor material named, you have no way to know what you are sleeping on.
5. Naturnest Sirius 1 Plus Annex Room – Same Fabric as the Tent
Naturnest Sirius 1 Plus Annex Room for Naturnest Sirius 1 Plus Rooftop Tent Only, Not Include Rooftop Tent
Fits the Sirius 1 Plus
420D tear-resistant fabric
Blackout with mesh window
35 lb
Pros
- 420D tear-resistant fabric as used on the parent tent
- Seam sealing and waterproofing treatments published
- Fast rail and Velcro setup in about 10 minutes
- Blackout fabric with a breathable mesh window
- One owner kept warm and dry through a week-long rainstorm
Cons
- Annex only
- the rooftop tent is not included
- Condensation builds if every zipper is shut
- 35 lb is close to the heaviest here
The Naturnest is the one to read closely if weather is your main concern, because it is the only listing here that names its waterproofing method. It uses the same 420D tear-resistant fabric as the Sirius 1 Plus tent, with published waterproofing treatments and seam sealing, and it is described as sunproof, rainproof, and windproof rather than vaguely weather-resistant.
One owner took it on a week-long trip in the Pacific Northwest and reported staying warm and dry, with condensation as the only complaint. That is a single data point, but it is the most directly relevant owner report in this group for anyone camping in a wet climate.
Setup is fast and simple: connect one end to the tent rail, Velcro the fabric, fix the support pole, then run the wind ropes and ground nails. Published assembly time is about ten minutes, and the owner agreed that it was far less effort than pitching a ground tent. Aluminium poles, four-season rated, three-person capacity.
At 143.7 by 83.46 by 71 inches the published footprint is among the larger ones here, and the blackout fabric with a breathable mesh window you can open or close is a nice combination. Two sleepers fit comfortably with padding. It is sold as an accessory only, so the Sirius 1 Plus tent is a separate purchase, and the warranty is one year.
Cold floor and condensation, honestly
This is the annex owners most often ask about for cold-weather use, and the answer is the same as for every other model: the fabric keeps water out, it does not insulate. Underneath any annex you need a mat, and in genuinely cold conditions an insulated sleeping pad is the difference between sleeping and shivering.
The owner also flagged condensation when zippers are left open in wet weather, which is expected in any sealed space. The mesh window is your ventilation control: open it when you are cooking or sleeping, close it when the rain is horizontal.
Where this one falls short
Thirty-five pounds is close to the heaviest carry weight in this group, and a good part of that is the blackout fabric and frame. If you only need the annex for half your trips, that weight is dead weight for the other half.
One review and a one-year warranty is thin support for a fabric claim. The waterproofing story is well documented on paper, but nobody has yet tested whether the Velcro attachment and seams hold up through a full season of wet camps.
6. Overland Vehicle Systems HD Bushveld 2 Annex – No-Drill Fit, Zero Owner Reviews
Overland Vehicle Systems 18189902: Hd Bushveld 2 – Annex Room, Window & Doors, Green Body & Grey Trim
Fits the Bushveld II
420D polyester oxford
120g mesh windows
No-drill attachment
17 lb
Pros
- 420D polyester oxford waterproof body
- 120g fade-resistant breathable mesh windows
- Attaches without drilling or modifying the Bushveld II
- Green body with grey trim to match the parent tent
- Window and door panels included in one package
Cons
- No customer reviews at all
- Fits only the Bushveld II tent
- No published dimensions
- door count or occupant capacity
The no-drill attachment is the headline here and it matters more than it sounds. The annex fixes to the Bushveld II without drilling or modifying the tent, which protects your tent warranty and means you are not putting holes in an expensive clamshell fabric before its first trip.
On materials it matches what OVS does well elsewhere: a 420D polyester oxford waterproof body and 120g environmental fade-resistant breathable mesh windows, at 17 lb. The green body with grey trim is designed to line up with the Bushveld II’s own colours, and both window and door panels come in the same package.
What we cannot tell you is almost everything else. There are no customer reviews, no published dimensions, no door count, and no occupant capacity. The listing is accurate about what it specifies and silent on the rest, so treat the build quality as a reasonable inference from the fabric rather than a verified fact.
If you own a Bushveld II, this is a straightforward match. If you are comparing options on a different tent, this listing will not help you make the call.
What no-drill attachment gets you
Drilling a hole in a tent you paid for is permanent. An attachment that uses the tent’s existing rail or zipper track means the tent stays factory-spec, which matters for resale, warranty claims, and for the day you decide to sell the tent and keep the annex.
It also means faster setup. There is no drilling step, no sealant curing overnight, and no hardware to lose in a mud puddle.
What you have to accept
No reviews means no evidence about seam sealing, zipper durability, or how the mesh holds up after a season of UV exposure. Buyers who care about long-term durability should treat the first year as a test and keep the tent and the original fabric clean and dry when it is not in use.
No occupant capacity is also a mild annoyance if you are planning to use it for anything but a changing room and gear storage.
7. Tuff Stuff Delta Overland and Trailhead Annex – One Annex, Two Parent Tents
Tuff Stuff Roof Top Tent Annex Room, W/Floor, Delta Overland & Trailhead TS-ANX-DLT-TH
Fits Delta Overland and Trailhead
Floor included
One-year warranty
Tan trim
Pros
- Floor is included in the package
- Covers two Tuff Stuff tent models
- Tan trim coordinates with the Tuff Stuff Delta line
- One-year manufacturer warranty
Cons
- No customer reviews at all
- Very thin listing with no denier
- dimensions or weight published
- Only fits the Delta Overland and Trailhead tents
The useful thing about this listing is the compatibility. One annex covers both the Tuff Stuff Delta Overland and the Trailhead, which means if you are deciding between two Tuff Stuff tents, or own one now and want to switch later, the annex carries over.
A floor is included, and the tan trim is designed to coordinate with the Tuff Stuff Delta line. The warranty is one year, which is shorter than the four years published by OVS on the TMBK annex but not unusual for a smaller accessory.
Beyond that there is nothing published. No fabric denier, no dimensions, no weight, no door or window count, and no customer reviews. The listing is one line of copy and a fitment statement, which is enough to know it is compatible and not enough to compare it on quality.
If you already know your Delta Overland or Trailhead is the right tent, this does the job. If you are still choosing, you are choosing blind on the specifications.
Why covering two models is a real advantage
Annex compatibility is the single biggest source of wasted purchases in this category, because nearly every annex fits exactly one parent tent. An annex that covers two models gives you a second use for the same money, and it means changing tents does not mean changing the annex.
It also matters if you are buying as a pair of vehicles. One annex type across two matching tents means one packing process rather than two.
The deal-breaker here is missing data
There is no weight figure, and weight determines whether you can carry it. There is no floor material, so you do not know if it is PVC or polyester. There is no door count, so you do not know how well it ventilates.
If any of those three numbers matter to your trip, this listing will not answer them. Ask the manufacturer before you order rather than after.
8. Tuff Stuff Alpha II Annex Room – The Biggest Floor and the Heaviest Walls
Tuff Stuff Overland TS-ANX-CS2 Alpha™ II Clam Shell RTT; Annex Room
Fits the Alpha II
600D poly-oxford walls
1000D PVC floor
87 x 82 inch floor
37 lb
Pros
- Roomy 87 x 82 inch floor rated for two people
- 600D poly-oxford walls with a 1000D PVC floor
- Guide ropes and stakes included for wind
- Water-resistant with PVC coating
- Two-person rated
Cons
- No customer reviews at all
- Heaviest unit in the group at 37 lb
- Alpha II rooftop tent is sold separately
On raw materials, this one uses the heaviest fabric listed in this group, and the floor area is large. The walls are 600D poly-oxford, which is the heaviest fabric listed by any of these products, and the floor is 1000D PVC. The floor measures 87 by 82 inches, which works out to roughly 7,064 square inches, so two people can sleep, cook, or sit in it with room to move.
Guide ropes and stakes are included, and the manufacturer calls out stability in windy conditions specifically. The fastening is by buckle and zipper on a hanging attachment, so it needs a compatible Alpha II frame rather than a rail or track. Water resistance is listed as water-resistant with a PVC coating, which is a step below the ones rated fully waterproof.
It is rated for two people and for four-season use, and the listed category placement is the highest of any annex here, which suggests it sells in meaningful volume even without visible customer reviews on this listing.
The problem is weight. Thirty-seven pounds is more than double the ARB annex and the heaviest item we covered. Combined with the Alpha II tent itself, this is a serious payload and rack load, and the warranty on the accessory is listed as 30 days from the manufacturer, which is the shortest published term in this group.
Floor area and what you can do with it
At 87 by 82 inches this is genuinely a second room rather than a vestibule. Sleeping, cooking, sitting, or sheltering in bad weather all work. It is one of the few annexes here where two adults can move around inside without turning sideways.
The 1000D PVC floor is the piece to buy it for. It is the same floor weight class as the OVS TMBK annex and considerably heavier than the fabric floors used by most competitors here, and it is what lets you keep this as a wet-weather room rather than a dry-weather porch.
Where this one falls short
Weight is the deal-breaker for a lot of buyers. Thirty-seven pounds is fine if you carry the annex every trip and impossible to justify if you pack it away for half the year.
A 30-day manufacturer term is very short, and with no customer reviews there is nothing to compensate for it. If the fabric does not work for you, you have very little recourse.
9. TOPOAK Vision Annex Room – Narrow, Light, and Simple
TOPOAK Annex Room for Vision Rooftop Tents，75″ – Extra Spacious
Fits TOPOAK Vision RTTs
63 and 75 inch options
Packs to 39 x 11 x 11 inch
22 lb
Pros
- Compact 39 by 11 by 11 inch packed size
- Two size options to match your Vision tent
- Enclosed private ground-level space
- Simpler setup than a ground tent
Cons
- No customer reviews at all
- Rated water resistant rather than waterproof
- Only fits TOPOAK Vision rooftop tents
The TOPOAK is the one to look at if your priority is pack size and simplicity. It packs down to 39 by 11 by 11 inches, which is small enough to live in a garage or behind the seats permanently rather than taking up a rack slot, and it weighs 22 lb.
It comes in two versions, a 63-inch spacious model and a 75-inch extra spacious model, so you can match the annex to the specific Vision rooftop tent configuration you own. The footprint is listed at 106 inches long by 50 inches wide, which is a narrow span compared with the full-size annexes here and also fast to set up, since it hangs off the parent tent rather than standing as a separate structure.
The enclosed space does the job it is meant to do: a private ground-level area for changing, gear storage, and organizing camp essentials. Owners of Vision tents appreciate that it is one less piece of kit to learn.
It is rated water resistant, not waterproof, and the 50-inch width means you cannot fully stand up and turn around. For a changing room or a gear locker that is fine. For a camp kitchen in heavy rain for four people, it is tight.
Packed size versus floor space
This is the real trade with this annex. You get a 39-inch packed length, which is excellent, in exchange for a 50-inch width that is the tightest we covered. The long dimension means you can lie down along it, but you cannot work at a camp stove and turn around without stepping outside.
If your trips are short and your storage is tight, the packed size is a bigger win than the width is a loss. That is the case for a lot of weekend overlanders.
Who should skip this one
Skip it if you camp in sustained rain. Water resistant is a real step down from the waterproof ratings on the OVS, Smittybilt, and Naturnest annexes, and the zipper seam where the annex meets the tent base is the first place wind-driven rain finds its way in.
Skip it if you plan to cook inside. A 50-inch-wide space with a water-resistant body is not a kitchen in bad weather. It is a locker with a roof.
10. Body Armor 4×4 Sky Ridge Pike 3 Annex – Most Floor Space per Dollar
Body Armor 4×4 Sky Ridge Pike 3 Annex Room 20016
420D ripstop oxford
550GSM PVC coated floor
52 sq ft added space
Entry door and two windows
Pros
- 420D ripstop polyester oxford body
- 550GSM PVC coated waterproof floor
- Adds 52 sq ft of downstairs living space
- Entry door plus two large windows
- Two-year finish and limited lifetime warranty
Cons
- No customer reviews at all
- Annex only
- tent and rack sold separately
- Listed as having no UV protection
The Body Armor annexes itself on a single number: 52 square feet of added downstairs space. That is the largest stated floor area of any annex we covered, and it is what this product is for. The Body Armor Sky Ridge Pike 3 is a vehicle-specific fit for that UTV rooftop tent model.
Materials are respectable. The body is 420D ripstop polyester oxford and the floor is 550GSM PVC coated waterproof fabric, which is a heavier floor than most of the fabric floors in this group and considerably heavier than a bare tarp. A door and two large windows give it more glazing than most, which helps with light and airflow.
The warranty terms are the most generous published here: a two-year finish term paired with a limited lifetime manufacturer warranty from The Wheel Group, which is a rare thing to see on an accessory of this size.
Two things to weigh. The listing states no UV protection, which over a multi-day trip matters for fabrics and for anything you store inside. And there are no published dimensions or packed size, so plan for it taking more space than the weight suggests.
What 52 square feet actually gives you
It is enough for two camp chairs and a table, or a gear wall on one side and a sleeping mat on the other, or a full family changing and dressing area. It is the sort of space where you can keep the kids inside out of the weather while adults cook, which is the single most common reason families buy an annex.
The PVC coated floor is the reason that works. You can bring wet gear in, hose it down, and it does not wick water into everything else you have stored there.
Who should skip this one
Skip it unless you own the matching Body Armor rooftop tent, because this is a vehicle-specific fit and it is sold as an annex room only. The tent, rack, and other accessories are separate purchases, so the total cost of the setup is well above this one item.
Also skip it for long trips in bright sun. No UV protection is a listed spec, and overlanding is exactly the use case where that shows up as fading in the first season.
Annex vs Awning: Which One Do You Need?
These get confused constantly, and the confusion costs people money. An awning is a horizontal canopy. It gives you shade and rain deflection over a cooking or seating area, attaches to a rack rail or a tent rail, and costs less because there are no walls, no floor, and no zippers. An annex is a full room: vertical walls, a roof, a floor, a door, and windows.
Here is the short version. An awning answers a shade problem. An annex answers a shelter, privacy, bug, and storage problem. If you only need to stay dry while you cook, an awning does that for a fraction of the weight. If you need to be bug-free, private, and standing up in the rain, an awning cannot do it.
Several owners on the forum make the same point from different directions. One Smittybilt Overlander Gen 2 owner planned the annex specifically as a mosquito-proof camp kitchen rather than extra sleeping space, which is the most common framing we saw. In a Facebook overlanding discussion, owners described the ideal build as an enclosed, weatherproof annex with a side awning for shade, which is to say the two are complements rather than substitutes.
There is a third option that most people forget: a ground tent. A freestanding ground tent gives you more usable floor area than most annexes, costs less, and is much easier to heat on a cold night. The trade is that you have to pitch it, you carry the poles and pegs, and you sleep on the ground. Owners who already carry a ground tent for exactly this reason often decide an annex is redundant for them.
Our read is that the awning is the first purchase for a solo camper, and the annex is the first purchase for a family or anyone who needs a room. If you have both a rack and a reason to stand in the rain, you will end up owning both eventually.
How to Choose a Rooftop Tent Annex Room
1. Match the tent model before anything else
Almost no annex is cross-compatible. The Smittybilt fits part 2683 and nothing else, the Tuff Stuff Delta annex covers two parent models, and the Body Armor unit is vehicle-specific. There are two exceptions worth knowing about: the Tuff Stuff Delta Overland and Trailhead annex serves both of those tents, and the OVS Bushveld II annex uses a no-drill rail attachment that in principle suits any compatible Bushveld II.
The other thing to check is where it attaches relative to the ladder. Most annexes zip to the base of the tent on the side away from the ladder, which keeps your entry clear, but a few attach across the ladder end. If the annex blocks your climb, you will resent it after the fifth night.
2. Check the floor before the fabric
The floor is the most-discussed part of any annex and the most neglected in product listings. A PVC floor, like the 1000g version on the OVS TMBK annex or the 1000D floor on the Tuff Stuff Alpha II, can be rinsed, dries fast, and survives wet boots and a wet dog. A polyester floor is lighter and cheaper but absorbs water and never fully dries in a packed vehicle.
Removable beats fixed, and zippered beats hooked. You can hose a detached floor, dry it, and fold it separately, which is the difference between an annex that smells fine next season and one that does not.
Then be honest about insulation, because no annex floor here insulates. Cold ground comes up through any of them in winter. Add a foam mat or an insulated sleeping pad and this stops being an issue.
3. Read the denier numbers
Denier is simply fabric thickness. 420D polyester oxford is the common standard and it performs well in most conditions. 600D poly-oxford, used on the Tuff Stuff Alpha II annex, is a heavier and more abrasion-resistant fabric, and it is the right choice if you camp in exposed rocky ground or haul the annex in and out of the truck often.
Below 300D, treat the annex as fair-weather only. Above that, look at whether the seams are sealed rather than just stitched, and whether the coating is polyurethane or PVC. The Naturnest annex is the only listing here that explicitly publishes seam sealing as part of its waterproofing, which is worth noting if rain is your main concern.
4. Read water-resistant and waterproof as different words
Waterproof means the fabric itself does not let water through. Water resistant means it is treated to shed light rain for a period and eventually gives up. In this group, the OVS TMBK, OVS Bushveld 2, Body Armor, and Smittybilt annexes are described as waterproof, while the TOPOAK Vision annex is rated water resistant and the Tuff Stuff Alpha II is water-resistant with a PVC coating.
The most common leak report we see is not through the fabric. It is at the zipper seam where the annex meets the tent base, in wind-driven rain. Taping that seam with seam sealer before your first trip is cheap insurance and takes about ten minutes.
5. Budget for the weight and the pack volume
The annexes here range from 13 lb to 37 lb, and that spread is large enough to change your vehicle setup. Heavier units are usually the ones with heavier floors and heavier fabric, and they are also the ones you will leave behind on short trips.
Add the packed volume to your rack math, not just the weight. If your rack is already carrying a tent, a cargo carrier, and recovery gear, a 37 lb annex is a decision about what comes off. Our cargo carrier picks for camping trips cover the storage side of that trade.
6. Set it up once at home before you rely on it
Owners consistently trust real setup time over spec sheets. Published times range from about ten minutes for the Naturnest rail and Velcro attachment to something much longer for anything with more poles and windows, and nobody publishes an honest figure for setting one up in wind.
The practical step is to pitch it once in a driveway, learn the zipper track, work out which guylines go where, and note how long it actually takes. Do it at home, in daylight, with no rain coming. Several owners also recommend replacing thin supplied pegs with proper stakes before the first windy night, since round-cross-section pegs are a recurring complaint.
Safety inside an enclosed annex
This gets almost no coverage anywhere, so here it is plainly. A propane stove or a heater inside a fully enclosed annex moves oxygen in and combustion gases out through the same openings you close to keep bugs out. Ventilate deliberately: crack the door, run a fan, and never leave a combustion heater running unattended or overnight. Keep a working extinguisher within reach, and never run a stove under the tent floor or inside a sealed annex with the zippers shut.
Who should skip an annex entirely
Solo campers in fair weather can skip it. The space is real but the added weight, the pack volume, and the extra setup step rarely pay back for one person who already sleeps in the tent above.
Skip it if you already carry a full-size ground tent. A ground tent gives you more usable area, costs less, and is easier to warm. Skip it if you never cook outdoors, never have kids or a dog at camp, and are happy changing inside the vehicle. And skip it if your tent has no published annex at all, because a mismatched universal annex is a bad use of money and rack space.
If lighting matters for evening use, our camping lantern picks for tents cover the options that actually fit inside an annex without glare.
Frequently Asked Questions
Are rooftop tent annex rooms worth it?
For families, overlanders who cook in the rain, and anyone with kids or a dog, yes. An annex turns a sleeping-only rooftop tent into an enclosed, bug-free room for changing, gear storage, and cooking shelter. Solo campers in fair weather can usually skip it, since the added weight and pack volume rarely pay back for one person.
Which rooftop tent has the best annex?
The Smittybilt 2688 GEN2 XL annex has the strongest owner record, with 20 reviews and a 5.0 average. The OVS TMBK annex has the most features per dollar, including a removable 1000g PVC floor and four doors, and the Tuff Stuff Alpha II annex has the largest floor area and the heaviest fabric. Best answer depends entirely on which parent tent you already own.
Does a rooftop tent annex come with a floor?
It depends entirely on the model. The Smittybilt 2688, OVS TMBK, Tuff Stuff Delta, Tuff Stuff Alpha II, OVS XD Sherpa S4S, and Body Armor annexes all include a floor. The ARB 804100 Simpson III annex does not include one according to owner reports, and that is the most common complaint in its reviews.
Is a rooftop tent annex room waterproof?
Most are treated or coated to be waterproof, and the key differences are fabric weight and seam sealing. The OVS TMBK and Bushveld 2 use 420D polyester oxford rated waterproof, the Tuff Stuff Alpha II uses 600D poly-oxford with a 1000D PVC floor, and the Naturnest Sirius 1 Plus annex publishes seam sealing as part of its waterproofing. Some models such as the TOPOAK Vision annex are only rated water resistant.
Will an annex from one brand fit another brand’s rooftop tent?
Almost never. Nearly every annex is engineered for one parent tent model, and the Smittybilt 2688 fits only part 2683. The rare exceptions are the Tuff Stuff annex that covers both the Delta Overland and Trailhead tents, and the OVS Bushveld 2 annex that uses a no-drill rail attachment. Confirm the exact parent model before ordering, because a mismatch is a wasted purchase.
Can you sleep in a rooftop tent annex?
You can, and two of the annexes here are rated for sleeping, but you give up the off-ground advantage that makes rooftop camping worth it in the first place. Sleeping on the ground also puts you on an uninsulated floor, so you need a mat and an insulated pad underneath you. Most owners use the annex for changing, storage, and cooking instead.
Is a rooftop tent annex better than an awning?
An awning gives you shade and rain deflection over a cooking area for less weight and money, but it has no walls, no floor, and no bug protection. An annex is a full enclosed room. Buy the awning first if you are solo and only need shade, and choose the annex if you need to stand up, change, and stay bug-free in the rain.
Can you run a stove or heater inside a rooftop tent annex?
You can cook inside an annex, but never with the zippers fully closed. A propane stove or combustion heater in an enclosed space draws oxygen in and pushes exhaust out through the same openings. Crack a door, run a fan, keep a fire extinguisher within reach, and never leave a combustion heater running unattended or overnight.
Where to Start With Your Rooftop Tent Annex
If you own a Smittybilt GEN2 Overlander XL, buy the Smittybilt 2688 annex. It is the only annex in this group with a large body of consistently positive owner feedback, a removable zippered floor that handles mud, and an attachment that takes minutes. If you want the most usable space for the money and your tent is an OVS TMBK, the OVS TMBK annex gives you a detachable 1000g PVC floor and four doors that no other option here matches.
Everything else depends on the tent you already own, because compatibility decides this purchase before any other factor. Confirm the exact parent model, then confirm the floor, then worry about fabric. If you are still choosing the tent, start with our overlanding rooftop tent guide, pick first, and come back to match the annex. Whichever one you choose, set it up in your driveway before the first trip, and check the ladder side before you commit.