Cargo Trailer Camper

We're building a wheelchair accessible camper from a cargo trailer. The trailer is 7' wide by 12' long with a rear ramp door. We ordered it with brakes, two roof vents (one with a 12vdc fan), aluminum rock guard and a drop axle for a lower deck height.

The trailer was built in California by Carson Trailers, and some of the initial fabrication was done by a local trailer repair shop. The fabriactor installed two windows, wall & ceiling insulation (1" poly-iso) and covered them with 3/8" plywood. The above photo shows the window rough opening, ready for installation.
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The day we picked it up. The outside looks great! Lots of work left to do on the inside.
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On my first free weekend, I picked up the trailer from the storage yard and parked in the "back 40" of a nearby Lowe's. The mission for the day was to build a rear wall. The rear wall will be constructed from 2"x2" framing and skinned with 3/8" plywood. And entrance door will be added later.
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2 inch lumber, glued and screwed to the plywood wall, ceiling and floor. The wiring is for a battery and various light switches.
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The ramp assist is a coiled spring on a spindle. It's location means that the wall needs to be inset about 8".
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Outer walls done. Doing this work in the Lowe's parking lot was an excellent idea. I needed to run back in a few times for forgotten or wrong purchases, and each of those trips would have cost precious time..at least 1/2 hour each. Added bonuses is a wide selection of snacks, and an IHOP next door for "nutrition."
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1 1/2" rigid insulation inside the wall cavity.
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Pergo laminate flooring is pretty simple to install, and the results look great.
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Flooring done, with a 5-star review.
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The full-size bed will be located at the forward end of the trailer, across the width. (This configuration allows enough room for wheelchair approach.) We screwed 4' lengths of e-track to the walls, using self-tapping metal screws where we could anchor to one of the vertical steel studs. 2" x 4" lumber was cut to length and attached using 2x4 sockets.

The completed frame shown above is only 4' wide, but a full-size bed is 54". We added supports to the side near the wall with 6" pieces of 2x4 (not shown here, I'll try to get a pic when I can.) I don't plan on sleeping that close to the wall...it was mostly to keep the mattress from sagging.
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3/8" plywood covers the lumber frame, and a mattress gets thrown on top.
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The door will be 3' wide by 6' tall. The outer skins will be 3/8" plywood, the interior frame made up of 1" x 8" boards for the verticals, 1" x 6" for the the horizontals.
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All wood is glued & screwed. 1/2" rigid foam insulation is added to the cavity, with the reflective side facing out.
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After many rounds of test-fit, trim, test-fit, trim...the door fits. The gap around the perimeter isn't very consistent,but it's a solid door and should serve.
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Installing the latch required a lot of small adjustments.
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Somehow I managed to draw my cutout too large. Measure twice...three times if needed!
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I'm sure there are specialized tools for installing latches. I don't have them.
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More hammer & chisel work to fit the strike plate.
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I used a strip of license plate to hide my oops.
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A gate cane bolt keeps the door in place.
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Simple casing around the doorway's interior spiffs it up for little cost.
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Prime with a little help from my friends. We went with two coats of high-hiding, water-based Zinsser to cover the knots. We also burned some time filling the cracks & holes with lightweight spackle.
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The color is Valspar's "Like Butter". 1 Gallon was just enough.
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The small wall to the left of the toilet will be replaced with a moveable curtain. Stay tuned!
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The sink platform was made from the pallet that carried the sidecar all the way from Kiev, Ukraine.
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The faucet is a motion-sensing model. The fresh and waste water will be stored in gallon jugs. Pressurization is via a 12 volt Shurflo pump and accumulator tank. The limited wall space beneath the sink made for some strange hose routing.
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The far tank was initially set up with a quick-release attachment for garden hose, but the seal wasn't so great causing the pump to be unable to prime.
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