I have sold 2 rv's and many cars on traderonline. They do cars, boats, rv's etc. I have had good luck w/ them. I usually purchase the "run til it sells" option but I have to let them know every 3 weeks that the vehicle is still for sale. Usually done by email(they notify me) and can be done by phone. For something that expensive, you might consider an RV escrow company. I have never used them but you might want to check into them and see if anyone else has used them. I think they advertise these escrow companies on traderonline. I think you are selling at a good time. The 2 rv's I sold I tried to sell in October (different years) and they did not sell until Feb. and March. You think I would have learned the first time. Good luck and very nice coach by the way. We almost bought an 02 Journey 32T DL last year but decided to stick w/ a 5er and get bunks since we are just starting w/ kids, plus I just can't see getting rid of the Dodge/Cummins just yet.
2006 Dutchmen Colorado 28TB
2006 2500 Dodge Megacab 5.9 Cummins, 48RE, Superglide