I've thought about doing this a lot and would love to do it. I've seen used box trucks for sale for about 3k. I've also thought about getting a flatbed, like a low landscaping truck, and pitting a trailer body on that. I think with some work, you could turn the box into a really nice work and sleeping space. It makes sense for me because I don't have a pit that I can roll on and off of an enclosed trailer. It needs to be permanently mounted to something. In my shoes, I would consider the box truck approach a poor man's RV. If you have a rollable cooker, I'd look at a trailer if you have the truck/suv/van. Otherwise, I think a box truck is a good idea. Besides the cost, the only thing that's held me back, and I've looked at it some-what seriously, is the question of buying a used box truck with a lot of miles on it. How is the upkeep and maintainence going to be on that?
dmp