You might try to find an ambulance body off a dually van/truck. They vary in size but average ones are 12' long, SUPER strong alloy aluminum extrusion welded joints and well insulated. I found one lightly rolled, awsome find for $400, I talked to a few guys who scrap the older aluminum ones and they said it is hard to crush them with a trackhoe. It is skinned in 1/8" aluminum. The one I have is a Lifeline type I or II (dont remember) but I would bet it would cost 40k just for the rear body new. As a bonus there was a bunch of electricals left in it. You could then use tires and axles of your chosing, I am using 17.5" singles good for 6000lbs each on a custom frame.
http://www.lifelineambulance.com/products.html Ironwood
There is a guy on expedition portal who bought a u haul body then chopped the bottom off and clamped it on top the bed rails of his truck.
If I could find a place to buy 1/8" x4' x8' aluminum affordable and a bending brake big enough I drew out a design to re do my whole camper in 1/8" aluminum so the outside skin is basically the frame, like the body of a car.
But the cost is more than my budget so I'm using plywood and 1x lumber like the original.
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