A Toyota 4Runner camper build comes down to one thing: a flat sleeping platform with storage underneath. Everything else, the kitchen, the fridge, the power, the window covers, bolts onto that decision. There are two ways to get there. Build the platform yourself from plywood over a weekend or two, or drop in a kit made for your generation in about 10 minutes. This guide covers both honestly: what the 4Runner gives you to work with by generation, a real DIY plan with real costs, and where a kit makes more sense.
Why the 4Runner Is Worth Building Out
The 4Runner is body on frame, so the washboard forest road that rattles a crossover apart is a Tuesday. The cargo floor is wide between the wheel wells, the roof is tall enough to sit up on a platform, and the rear hatch glass rolls down, which almost nothing else in this class does. That glass is the reason 4Runner campers can vent, cook, and reach the drawers without opening the whole hatch in the rain.
The catch is the same as every SUV: the rear seats do not fold flat. They sit high and slope, and the floor drops into the footwell behind the front seats. Sleep on them once and you understand why every 4Runner camper build starts with a platform.
What You Are Building To: 4Runner Cargo Space by Generation
- 3rd generation (1996 to 2002): The smallest cargo area of the modern 4Runners, but the floor is flat and the wheel wells are far enough apart for a 40 inch wide bed. Standard height platforms fit. A good candidate because these trucks are cheap and unkillable.
- 4th generation (2003 to 2009): Roomier than the 3rd gen. Both standard and tall platform heights fit. The optional third row seat on some models has to come out before any platform goes in.
- 5th generation (2010 to 2024): The most common build platform by a wide margin, and the easiest, because the cargo dimensions did not change across 15 model years. A platform built for a 2012 fits a 2024. Two things do not play well with a platform: the optional third row seat and the sliding rear cargo deck. Remove either before you build.
- 6th generation (2025 and newer): The redesign changed the floor. Hybrid models carry the battery under the cargo area, so the floor sits higher than the non hybrid. A platform built for one does not fit the other. The 6th gen third row is a different shape again and gets its own fit. Measure your specific truck before cutting anything.
With the rear seats folded, the usable raw floor in a 5th gen runs a little over 6 feet to the front seatbacks, but the last stretch is the sloped seatback, not floor. A platform is what turns that into a real bed. On a platform sized to the truck, you get a 40 inch wide bed that is 65 inches long at standard height or 74 inches long on a tall platform, and the difference between those two is the most important decision in the build.
Standard or Tall: The Decision That Shapes Everything
Standard height, about 8.75 inches off the floor. Maximum headroom. Easy to sit up, change clothes, and read. Drawers underneath have about 5.5 inches of internal height, enough for clothes, a stove, cookware, and food. Bed length is 65 inches because the platform stops where the folded seatbacks rise. Great for campers up to about 5 foot 6 sleeping straight, or anyone who sleeps a little curled.
Tall height, about 14 inches off the floor. The platform clears the folded seatbacks entirely, so the bed runs 74 inches, which sleeps someone around 6 foot 2 fully stretched. Drawers get 11.25 inches of internal height, enough for a fridge, a water jug, or a full kitchen bin. You give up some headroom above the bed. Owners who are tall, or who camp two up and want the length, consistently choose this one.
If you are building your own, decide this first. It changes the frame height, the drawer boxes, and whether your platform needs to bridge over the seatbacks at all.
DIY 4Runner Camper Build: The Plan
This is the plywood and 2x4 build you see in most videos. It works. Here is what it actually takes.
Materials
- Two sheets of 3/4 inch plywood for the deck and drawer boxes. Birch or sanded pine for a clean finish, about $60 to $90 a sheet.
- 2x4 or 2x3 lumber for the frame, or 1 inch square steel tube if you weld.
- Two pairs of full extension drawer slides. Skip the cabinet grade ones from the hardware store, they fail on washboard. Locking slides rated for 250 pounds or more are the part that decides whether your drawers survive a season. We sell the heavy duty locking slides we use in our kits separately.
- Carpet or a rubber mat for the deck surface, contact cement, wood screws, wood glue, corner brackets.
- Ratchet straps or turnbuckles and hooks to anchor the platform to the factory cargo tie-downs.
Tools
Circular saw or table saw, drill, jigsaw for the wheel well cutouts, tape measure, square, sander. A pocket hole jig makes the frame much stronger. Budget for the blade and bits you will find you need halfway through.
Steps
- Measure the truck, not the internet. Width between the wheel wells at floor level and at platform height (they are different). Length from the tailgate to the folded seatback, and from the tailgate to the front seatbacks with the seats where you actually drive. Height from floor to headliner. Note where the tie-down points are.
- Build the frame. Two long rails, cross members every 16 to 20 inches, legs at your chosen height. Leave the area between the wheel wells open for drawers.
- Cut the deck. Cardboard template first. The wheel well cutouts and the taper toward the front are where builds go wrong. Cut once, fit, trim, fit again.
- Build the drawer boxes. Size them to the slides, not the other way around. Leave clearance so they do not bind when the truck is on a slope.
- Handle the seatback slope. Either stop the platform at the seatback (65 inch bed) or build a hinged or removable extension that rides over the folded seats (up to 74 inches). Extensions are the hardest part to get right and the part most DIY builds skip.
- Finish and anchor. Carpet the deck, round every edge that will touch trim, and strap the platform to the factory tie-down points. Never drill the floor. It compromises the underbody coating and kills resale.
What it really costs
Materials with decent slides land between $350 and $600. Add $100 to $200 in tools if you do not already own them. Time is the bigger number: most first builds take 20 to 40 hours across two or three weekends, including the trip back to the store for the thing you forgot. The result weighs 80 to 120 pounds and comes out in two pieces if you planned for that, or not at all if you did not.
We wrote a longer general version of this in our guide to building a camper bed platform. Worth reading before you buy plywood.
The Kit Route: Same Result, 10 Minutes
The Compass Camper 4Runner kit is the build above, already done and sized to your generation. Aluminum extrusion frame instead of lumber, so it does not warp, creak, or gain weight in the rain. Two full extension drawers on heavy duty locking slides with removable dividers. A retractable bed extension that rides over the folded seatbacks and slides back into the trunk when you need the rear seats. It anchors to the factory tie-down points with turnbuckles. No drilling, no tools, about 10 minutes the first time.
You pick your generation and height at checkout: Gen 3, Gen 4 standard or tall, Gen 5 standard or tall, and Gen 6 hybrid, non hybrid, or third row. The deck comes in marine grade carpet or Hex Ply, a phenolic coated plywood that is harder and slicker than carpet, so heavy bins slide in and out without snagging and spills wipe up. Slick cuts both ways, so strap gear down on rough roads. Add-ons include a lift up shelf, a pull out table, and a 60/40 split extension that keeps one rear seat up for a passenger or a dog.
Kits run $1,799 to $1,899 depending on generation and height.
Build vs. Buy, Honestly
Build it yourself if: you enjoy the project, you own the tools, you have a specific layout in mind that no kit offers, or the budget genuinely stops at $500. A well built DIY platform is a good platform.
Buy the kit if: your time is worth more than $30 an hour, you want it out of the truck in minutes for a hardware store run, you drive a 6th gen and do not want to measure around a hybrid battery, or you have watched enough build videos to notice that the second version everyone builds looks a lot like a kit. The frame will still be square in ten years, and it moves to your next 4Runner of the same generation.
Either way, do not sleep on the folded seats for another season while you decide.
Finishing the Build: What Goes Around the Platform
- Mattress. A 2 to 3 inch tri fold foam mattress on a flat deck beats any air mattress and does not deflate at 2 am. We make precision fit mattresses cut to the 4Runner platform.
- Kitchen. Drawers that pull out past the tailgate are the counter. Stove, cookware, cutting board, wash basin in one drawer. Food and a cooler or 12V fridge in the other, or in a fridge slide next to the platform on a tall build.
- Power. The factory 12V outlet handles phones. A 500 to 1,000 watt hour portable power station in a drawer runs a fridge, a fan, and lights for several days. A folding 100 watt solar panel on the roof rack keeps it topped up.
- Ventilation and privacy. Roll the rear glass down two inches and crack a front window for cross flow. Mesh window socks keep bugs out. Cut reflective insulation to fit each window for privacy and warmth.
- Lighting. A magnetic LED strip under the hatch and a small lantern inside. Cheap, and the difference between a cargo area and a room.
Frequently Asked Questions
Can you sleep in the back of a Toyota 4Runner?
Yes. With the seats folded and a platform in, you get a 40 inch wide bed that is 65 inches long at standard height or 74 inches long on a tall platform. Without a platform, you are sleeping on sloped seatbacks with a footwell gap. It works for one night.
Does a platform work with the 5th gen third row seat?
Not with the seats in. The third row and the sliding cargo deck both have to come out. Most owners remove them for good. They unbolt and go back in for resale.
What about the 6th gen 4Runner?
Hybrid and non hybrid have different cargo floor heights because of the battery, so they need different platforms. The 6th gen third row is its own fit. All three are available as kit options.
Is a 4th gen 4Runner a good camper build?
One of the best value builds available. The cargo area takes the same standard and tall platforms as the 5th gen, and the trucks are inexpensive. Remove the optional third row first.
Can I leave the build in for daily driving?
Yes, if it is designed for it. A platform with a retractable extension lets the rear seats go up with the drawers still in place. A fixed DIY deck that runs over the seatbacks does not.
Ready to skip the plywood? See the 4Runner sleeping platform and camper conversion kit and select your generation, or browse all 4Runner camper kits.