Teardrops n Tiny Travel Trailers

8.5' x 16' Refrigerated Cargo Trailer, Auction Fort Payne, AL
Ok, so it was ordered as a morgue trailer, (Ewww), but never used. New ~ $ 40K, bidding under $ 4K right now. Well you'd have to get a little creative with your build, but it's got most everything you need as a startup.
https://www.govdeals.com/index.cfm?fa=Main.Item&itemid=278&acctid=473#media
similar build specs:
http://hazmatmedical.com/morguetrailer.htm

My wife refused to use the trailer that I built specifically for her to use, after getting inside it for five minutes. She said that it's so small (4x8), and dark inside (it's grey, balack, and silver-inside and out-), that she felt it was like a "coffin". And she admitted to claustrophobia, as well. So much the better; I get to use it now...it's my trailer. I wish I had the money to get the "morgue trailer" for her and her crypto-zoologist friends to camp in....