Hi, Rosemary! I bought a used 20' class C a year and a half ago. I really wanted a short one because I didn't want to tow a car, either. The short ones are hard to find, and one night I got crazy and bid on one on ebay that was at least in my same state (Florida), and although I had to spend some money on repairs to the cabover (used class C's that have the window in the front pretty much all will have some rot), I found a local mobile repair guy who did all that repair and lots of little updates I wanted, and I still don't have $15,000 in it, and I love it so much I could kiss it! I'm about ready to take my 2nd trip in it, this time heading west.
Good luck in your search, and since you're looking for something I've got some experience with, feel free to ask me anything I might be able to help with!
Lopo (my name is Lois, but my nickname is Lopo in person as well as online)