I found my current spot by just driving around. Guy owns a pool supply business and rents half his lot to a U-Haul place, other half for RVs and work trailers and whatnot - I noticed all the RVs as I was driving past. Tried to contact him for months while my bus was at another spot getting robbed periodically, but he was avoiding me because he'd rented to another skoolier before and the dude had dumped his seats in one of pool guy's outbuildings and split without paying rent. When I finally cornered him, he agreed to rent me a spot and negotiated me down to $75 a month. No lease or signed anything, and he could care less whether I have a registration and insurance (although I do).
Having a place that provides electricity is not so important as I originally imagined. It's very easy to get a cheap used generator on Craigslist and run that when you need. A source of running water and a sewer would be much more useful than electricity. When you're painting and seam-sealing and whatnot, having stuff be really well cleaned is very important, and it's a pain in the ass to haul water around in five-gallon jerrycans.