Truck camper remodel

Every other camper on this site carries its own weight on its own axles. A truck camper does not. It sits in a pickup bed and every pound of it is borrowed from the truck, which means the limit on your remodel was set at a factory you never visited, by people who had no idea you were going to add a battery bank.

So this page starts where a truck camper project actually starts, which is not the camper. It is a yellow sticker inside your driver’s door.

The number that decides the whole project

Open the driver’s door and read the tire and loading label on the jamb. It says something close to “The combined weight of occupants and cargo should never exceed” a figure in pounds. That figure is your payload, and the wording is the important part: occupants and cargo, together.

That one number has to cover all of it. The camper. Everyone in the cab, including you. The fuel you added after the truck was weighed. The tie-down hardware, the tools, the dog, the firewood, and every single thing you are about to build into the camper.

Two things make this sticker the only figure worth trusting:

• It is build specific. The brochure payload for your model and trim is a best case. The jamb label was printed for the truck you actually own, with the options it actually left the line with. A sunroof and a heavier trim package spend payload before you ever see the truck.
• The camper’s advertised weight is not what is in your bed. The weight guides for truck campers are consistent on this. Dry weight is the camper as it leaves the factory, without fresh water, and commonly without batteries, dealer-fitted options or any gear. Wet weight is that plus the full tanks, the propane, the batteries and the things you live with. Water alone runs about 8.3 lb per US gallon, so a tank in the tens of gallons is a few hundred pounds on its own.

Write the payload figure at the top of a page and subtract as you go. It is a dull way to start a remodel and it is the only thing that stops the project becoming a different project six months in.

Center of gravity, which is the part people skip

A trailer punishes bad weight placement with sway. A truck camper punishes it by unloading your steering axle, and that is a worse failure mode.

Look on the side of the camper for a center of gravity sticker. Manufacturers mark it, often on both sides, and the fit guides from truck camper makers and the specialist sites all say the same thing about where it has to end up: the marked center of gravity sits over the rear axle or forward of it, never behind it. Northern Lite’s fit guide and the Truck Camper Adventure write-up on center of gravity both treat the forward position as the target, not the nice-to-have.

The reason is worth understanding, because it tells you where your new cabinets can go. Weight behind the rear axle acts on a lever. It lifts load off the front axle, which is the axle doing your steering and a large share of your braking, and it works the frame behind the rear spring hangers in a way that frame was not drawn for.

For a remodel, that turns into one rule. Everything heavy you add goes forward of the rear axle, and low. Batteries, water, tools, the inverter, the cast iron. The rear of a truck camper is the place for bedding, clothes and empty space. If a job forces weight rearward, the camper has moved and the center of gravity moved with it, so the position has to be rechecked rather than assumed.

Weigh it. Do not calculate it.

You can do the arithmetic and still be wrong, because the arithmetic uses published numbers and your rig is a specific set of real objects.

Load the truck the way you actually travel, with water in the tank and the gear aboard, and take it to a public scale. Truck stop scales give you axle weights separately, which is the point. Three limits have to hold at once:

• Each axle under its own gross axle weight rating.
• The whole truck under its gross vehicle weight rating.
• The load on each axle inside what the tires on that axle are rated to carry.

That third one catches people. The truck camper coverage of axle ratings makes the point that the ratings on the sticker are bounded by the wheels and tires the truck shipped with, so the OEM tire can be the real ceiling rather than the axle. Read the load rating on your own sidewalls and do that sum for the rear pair before you assume the axle figure is the binding one.

Weigh once before the remodel and once after. The difference is what your remodel actually cost in payload, which is the only honest answer to “is this build finished or is it too heavy”.

Rot lives in the cabover

On a truck camper the overhang above the cab is both the worst place for water damage and the most common place to find it.

The repair threads keep naming the same entry points: the seam where the cabover curve meets the front wall, the edge trim that wraps the nose, and the clearance lights mounted up there. All of them are on the face that takes rain at highway speed with a headwind behind it, and all of them are sealed with something that has a service life.

What makes it worse than the same rot in a sidewall is the geometry. The cabover is a floor cantilevered out over the cab of your truck, holding two sleeping adults, with nothing under it. Softness there is not cosmetic.

Probe it the way you would probe any camper floor, from below the mattress and around the front corners. If the wood gives, the repair is structural. There is a long tradition of consolidating minor damage with penetrating epoxy, and it has a place on a small firm area that has been dried out properly. It is not a fix for delaminated plywood or for framing that has gone soft, and on a cabover deck it is the wrong tool for that job. Open it, replace the wood, reseal every fitting on the nose with fresh butyl while it is apart.

The inspection sequence in where to start on a camper renovation works here unchanged, with the cabover moved to the front of the list.

Tie-downs are part of the remodel, not an accessory

The camper is held into the bed by four tie-down points and four turnbuckles, and a remodel changes what those are holding.

The clear consensus across the tie-down suppliers and the truck camper sites is that frame-mounted tie-downs are the stronger arrangement, because they anchor to the truck’s frame instead of to the sheet metal of the bed. A bed-mounted system carries the camper through the bed, so the camper moves whenever the bed moves. Torklift’s own guidance adds a detail worth knowing before you buy: spring-loaded turnbuckles are intended for frame-mounted systems, so the tie-down choice and the turnbuckle choice are one decision rather than two.

Tension them to the figure your tie-down manufacturer specifies and recheck after the first hour of driving. Whatever you do, do not tension by feel to “tight”, which either crushes the camper or lets it walk.

While you are under there, look at what your new weight is sitting on. Rubber bed mats compress, and a camper loaded heavier than it was last season will settle differently on one.

Materials, in both markets

Cabinetry in a truck camper is the easiest payload you will ever buy back, because the spans are short and nothing inside is carrying a floor load. Going from 3/4 in to 1/2 in on a cabinet side sheds roughly a third of that panel’s weight, and thin ply over a light frame sheds more again.

Units are the trap. A US sheet and a metric sheet sold under the same name are different products, so I have set them side by side rather than converted one into the other.

Do not treat a pair as one item. US ply is named nominally and milled under that name. Metric ply is what the label says. The gap is a fraction of a millimetre, and it is the difference between a groove that holds and a groove that rattles.

• Sheet size is not shared either. The US sheet is 4 ft x 8 ft, milled to 1220 x 2440 mm. AU and NZ merchants stock 2400 x 1200 mm, though some carry 2440 x 1220 mm as well. Continental EU stock is 2500 x 1250 mm. A cut list nested for the US sheet can be unbuildable on the AU sheet, because the long side is 40 mm short.
• The cabover deck is the exception to thinning out. It takes the weight of sleeping adults over an unsupported span, so it keeps its thickness and its framing.
• Hinges, catches and latches want solid material behind them. A screw into the edge of thin ply pulls out on the first hard corner, and a truck camper takes hard corners on washboard.

The cut list calculator will nest your panels on your market’s sheet and give you the sheet count, which matters here mostly because a sheet you did not need is weight you were never going to use.

The 12 volt side

Truck campers get driven to places without hookups, so the 12 volt system is usually the first thing people upgrade and the first thing they get wrong.

Charging from the truck through the factory 7-pin is the classic disappointment. The supplier explanations and owner accounts agree on why: the charge wire in a factory harness is small gauge running a long way, so the voltage arriving at the camper battery is well below what the alternator is producing, and the battery never gets anywhere near full no matter how long you drive. It is not a fault, it is a circuit that was designed to run trailer lights.

The fix is a DC to DC charger fed by cable sized for the current it will actually draw, not a heavier fuse on the old wire. The charger also isolates the camper battery from the starting battery when the engine is off, which is the other job the 7-pin does badly.

Three more things I would not skip in a truck camper specifically:

Fuse at the source, not at the load. The fuse protects the cable, so it belongs at the end where the energy comes from. That means at the battery and at the truck battery end of any charge run.

Service loops at the camper-to-truck interface. The camper moves against the truck constantly, and anything crossing that gap gets flexed. Fine stranded cable, enough slack that nothing is ever pulled tight, and a strain relief at both ends.

Crimped lugs with adhesive lined heatshrink. A marginal crimp is a resistance, and a resistance in a box that bounces down forest roads is a resistance that grows.

Cable sizing and bank sizing are both miserable to redo once the panels are back on, so the DC wire size calculator and the battery bank calculator are worth ten minutes before you buy anything.

If yours is a pop-up

A soft-side or pop-top truck camper adds the lift system to your list of budgets, and that budget is the one you feel personally, every evening, by hand.

The pop-up truck camper write-ups put typical roof weights across a broad band of roughly 100 to 400 lb, with the spread coming almost entirely from what is mounted on top: solar, a fan, a rack, a spare. That band is the thing to notice. The roof your lift was specified for is at the bottom of it, and every roof accessory walks it upward.

So the same rule applies as on any pop-up. Match the original roof weight or go under it, and keep whatever you do add spread evenly side to side, because uneven roof load lifts unevenly and twists the frame it is lifting. The pop-up camper remodel guide covers the lift system, the canvas lead times and the roof rebuild in full, and all of it applies.

The order of work

The sequence is set by what buries what, and by which findings can end the project.

1. Read the door jamb sticker and write the payload number down. Everything after this is subtraction.
2. Weigh the loaded rig at a public scale. Axle by axle, before you buy materials.
3. Probe the cabover and the floor. Water damage found now is a repair. Found later, it is a repair plus everything you built on top of it.
4. Structural repairs, then reseal every fitting on the nose.
5. Tie-downs and mounting hardware, while the camper is off the truck and you can see the frame.
6. Anything inside a wall, a floor or the roof. Wiring runs, plumbing, insulation.
7. Floor, then cabinets. Heavy things forward and low, always.
8. Reweigh, loaded. This is the step everybody skips and it is the one that tells you whether the build is done or over.
9. Cushions, fabric and trim. Last, as always.

Where the rest of this goes

Once the structure is honest and the weight is known, the interior work is the same as any camper. Flooring picks up when the subfloor is proven sound. If the cabinets are solid and only look tired, painting them is far lighter than rebuilding, and in a truck camper lighter is the entire game. RV storage ideas covers latches and load placement, which matter more here than anywhere else on this site, because the load is sitting on somebody else’s axle.