Probably wrong time of year to sell but ebay is a great way to gauge the price people are willing to pay for an item,
Put the TT on ebay with the reserve set at the price you want/hope to get and see how high the price goes (great if it goes above the reserve !!).
If it does not sell wait a while and try it again - see what is the highest bid.
I've done this a few times when trying to determine the "worth" of an item - I set the reserve realistically where the highest bid was and the item sold.
You probably may not sell the TT for what you WANT but you have to be realistic as well. It's like selling a motorcycle/convertible in October is less lucrative than selling it in April.
I've used Craiglist but RVTrader seems to be a good source.
Gerry
Gerry