I sold my previous TOAD/dingy on RV Trader "Tow Behind Car" just a few months ago. I was asking top dollar, but felt it was worth it. Had a number of inquiries and sold it in 3 or 4 months for close to my asking price.
One feature I like about the RV trader listing is you can list it until sold for (I believe it was) $89.00. So you don't have to be in a hurry to sell it before the ad runs out. Also you can edit and modify the ad at any time.
I sold my previous Class A a couple of years ago on the same web page with good response and results.
Jim