i've done it, although not as a long term thing. i used to live on the land four times a year, for between two weeks and a month, in a bender, with wood-burning stoves, and a tap (if we were lucky). the only thing which we couldn't do was grow our own food, cos we had different sites and didn't stay long enough to grow anything.
i know quite a few people who live like this permanently, and would probably be doing so myself, if it weren't for the fact that i'd feel vulnerable as a single female doing so.