Well we have had our trailer for 2 years now but we just aren't using it enough to justify keeping it. I have tried craigslist with not much luck. What sites have you guys used to sell your trailers?
I would also check out good consignment dealers in your area...not regular dealers who say they take consignments because those often just end up sitting there, but consignment only dealers. You won't get what you might get on Craigs List, but you will get a lot more people looking at your RV.
We have purchased our last two rvs at these places and sold one and have been very happy.