Craigslist works.... if you're priced right. I disagree this is a bad time to sell. This is the BEST time to sell. Everyone is gearing up for the summer and planning trips. RV dealers' best sales months are in the spring. Who thinks of buying an RV in November? Not many people.
As a rough guideline I'd tell you a 2 year old TT in good condition should sell quickly at about 50-60% of original MSRP. You should have paid around 70-75% of MSRP two years ago. If you paid more than that you're probably going to have to take a larger hit than you'd like to sell. Or, you'll have to wait longer for a buyer who is looking for something only your trailer has. Be patient too, I sold my TT over the winter.... finally. I listed on CL in November and it finally went at the end of January.