I designed and built this a few years ago. It’s fairly self contained including a fridge, stove/oven, 20 gallon on demand water, the stove and sink slide out of the galley for use, the faucet is connected to an on demand water pump. It’s solar powered. Inside is a queen size bed, fold down TV, DVD, cd, xm, direct TV. It weighs only about 800lbs so I don’t even notice it behind my truck. The rear hatch is held up by gas struts. I insulated it with 1.5” foam. I built the frame from an old frame and axle I found in a field, I had to cut it down a re weld it but it was free so I didn’t care. My wife and I have camped in it about twenty times over the last few years. I used to have a big fully self contained trailer but it was a pain to drag around, this is so much more fun! I had to learn how to anneal the aluminum trim that holds the aluminum sheeting on. I used 1/4 plywood for the exterior base and luan door skins for the interior.