Nice, cheap, clean, full time(at least monthy) RV parks...

Thanks to all of you for all of your suggestions.
Due to life style, being alone, and some health issues, I can't really take on a situation that would be... too "primitive". Also, I've found the most expensive part of RVing is moving around. I can spend several hundred dollars in a day of travel just on fuel and I'm more into staying in one place for at least a few months at a time. As I said, my intention is to get some photography work in the places I locate and I can't just hit and run to do that.
Thanks again.