
I built a simple box design on a 5.5 x 9 foot frame. This left plenty of room for a queen size bed (a memory foam mattress that we roll up), ATV, shelf for electronics/storage, and floor room for a bulldog and a great pyrenees. It also doubles (triples?) as a mobile dog kennel so the dogs can relax in the shade away from trouble (they always find it) when we camp. We also added an awning to the back door to keep the hot colorado sun out.
We took it to the dunes last weekend and it was great! Warm at night and cool during the day, very comfortable for us and safe for the dogs - I no longer have to convince my girlfriend to go camping, shes more excited than me now- Mission accomplished -
Some pics:



