my first C/O TC had a placard with a build date of 1955 and a three digit S/N. No manufacturer but the old gent I bought it from said it was a Kree Kamper (his spelling). Never found any solid ID nor have I ever seen one like it. Body was steel sheeting and interior was 1/4" plywood, torched and varnished. I had it in 1982/3 and by then the varnish had aged to a beautiful amber color. Had a blue, four burner stove / oven, a matching icebox (was a mini copy of a typical home fridge with a heavy door and solid lever / latch), a gas lantern over the dinette. No tanks, no toilet or shower, just a direct hose to inside faucet. Sink drain was a hose from the bottom of the bowl. The dinette cushions were automotive type seats with springs and horsehair batting covered in very heavy red and white vinyl (I think it was vinyl, might have been leather) The cabover was not very deep, a regular Army barracks matteress fit almost the full space. Primitive but it served our purpose well, which was to get off of the ground when camping. HAuled it on a '69 Chevy 1/2T, it was heavy but the truck did OK with it. The really unique thing was that the cabover had almost a foot of clearance over the trucc cab roof having been built when p/u cabs were a might taller. Because of this the lower front window of the camper afforded a great view to the front over the cab.
Definitely not the first TC but it was a great example of where they did start from. I need to dig in the attic to find the pics.
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1952 Buick 56R