We had really good results selling a 5er on RVTrader.com. I would take the option of "until it sells". It will cost you less in the long run! We also advertised it on Craigslist, but you have to watch out for all the scammers!
One bit of advice. Unless it's someone local that you know, tell them you can only accept a direct transfer of money from their bank to yours. DO NOT accept a money order or cashiers check!
Good luck, happy trails, and God bless!