JIM ALLEN: Yes, I have done it. I sold our 1988 Pace Arrow on ebay two years ago. I think you will find mostly lower priced units moving on ebay, as more expensive units would obviously require the seller to limit bidder interest by setting higher reserve or minimum bid amounts.
My primary motivation for listing on ebay was the relatively low cost, and the seller-determined time frame in which I would have to mess with the process. Other web-based sale sites can last indefinitely! I must confess that I also hoped to get a buyer from a greater distance away than the local newspaper classifieds would provide.

because I thought "once sold, I don't want to hear from that POS ever again"

As luck would have it, the sucessful bidder lives only about 30 miles away, but he is apparently quite happy with his purchase-he is a professional mechanic!

FYI, I netted about 40% more $$ than the dealer was offering, and did not find the process on ebay all that onerous.
Lastly, I believe you are almost always better off selling yourself, rather than trading. That seems to be the only way to be certain of what the replacement RV is actually costing you.
As a suggestion, why not list your RV right here on iRV2.com by using our FREE CLASSFIEDS SECTION.
Good luck with your sale. ED