Built a solar powered 6 x 10 back in 2000. We used it as a camper when we went to the multi-state FTX's KSM used to host in KY. It worked pretty well for the intended purpose.

As you mentioned, a used camper is an option. But, you have to be careful. There's a reason the owner is selling it "cheap". Most of the ones I've seen, even those that look ok, have a lot of problems. By the time you fix worn out brakes, leaking roofs, busted plumbing, and rotton floors that are hidden under moldy carpet, you'd be better off building a trailer from scratch. Plus with the bare bones utility trailers you start with a clean slate. You get to build it exactly to your own specs...not something designed by "Joe from RV World".

"The time for war has not yet come, but it will come and that soon, and when it does come, my advice is to draw the sword and throw away the scabbard." Gen. T.J. Jackson, March 1861