We sold our last tt on craigslist. Best dealership offer on trade was $5000 less than I sold it for on craigslist. Pricing is key. I looked at nada, I looked at New and used prices for my unit on rv trader.com and I searched craigslist locally to see what similar tt were selling for. We then arrived at a fair price that allowed for some negotiations. We also included the wdh and enough camping essentials that the new owners would be ok to just go camp in it (ie sewer hose, fresh water hose, 30 amp extension cord since our new unit is 50 amps, water pressure regulator and a set of lynx revelers.) We had lots of scammers but I had set up an email just for craigslist so that if a scammer got that email there was nothing they could do with it. I ignored the obvious scammers and didn't respond to businesses (hint do not include your phone number in the ad, use email only, you can later email a phone number). I had 2 people come look. The second one purchased it. It took just under 3 weeks to sell. We went to their bank and had a bill of sale notorized. Their bank (a local well known bank) transferred the money to my lien holder and the remainder was a cashier's check the bank gave us. When we had the title in hand we signed it over to the buyers at their bank, again utilizing a notary. We turned our tags in for a tax refund.
We gave them a good pdi, helped them set up the wdh, and even taught them about a brake controller and wouldn't let them tow until they had one. Overall it was a positive experience and I would do it again. Just remember to do everything locally and in person for your own protection.
As others said, empty it out and clean it up really well. Take pictures of it empty. Have it ready to be taken when someone looks at it. We washed, buffed and waxed ours and spent a great deal of time on the little details. Then again, ours was well cared for from the beginning. Basically, I thought about what I would look for and how I would want to see it. We opened everything up and demonstrated what we could with limited power. If a buyer was willing to put a deposit down then we were willing to go to a local campground and show every system worked. Both people that looked at ours said the fact we were willing to do that told them everything worked. Even though everything worked and our tt was in excellent condition, we made sure the bill of sale listed everything as is because you just never know what can happen with trailers.