The Rockwood would sell for $4000 if it were a cream puff with everything working, it sounds like an unsafe to drive wreck that will break down and leave you stranded on the highway.If the Blazer is really in good running condition you could sleep in it and/or buy a tent, a sleeping bag, a coleman stove,a lantern and an ice chest stay in primitive camp sites where tent camping is allowed for free. I hope you can find work that pays well enough for decent housing and food. I don't think that an old motorhome is an answer for you.