I sold my last coach on Craig's List. Took almost a month but had lots of interest. We found our current coach on RVTrader. They seem to have a lot of rigs, I am convinced you need lots and lots of pictures and include as much information as possible on the write up.
Buying used, I think you not only have to sell the coach but since it is a used coach and no warranty, the potential buyers are going to put a lot into their feel for the seller and their honesty, reliability.
Be as honest as possible when talking to the purchaser and establish your creditability so they have a comfort level that they are not being sold someone else's problem.
2007 Monaco Camelot 42' PDQ
2013 Lincoln MKX - Roadmaster Falcon 2 - RVi b
rake - TireSafe Guard TPMS