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?
Luckily I have done all of the good things on your list
Excellent - at least you're way ahead of your competition.
February (at least in the northern states)is not the best month to sell a TT (just like a motorcycle and a convertible); I think you may be a bit too early to attract buyers.
Wait for the warmer weather; I see as May/June as the best months; I've sold motorcycles/convertibles with best success in the Spring months. If you don't need the money - then just wait a couple of months.