I have had pretty good luck selling my past campers. Sure, sometimes it takes a month or two on craigslist but once someone comes to look, it usually goes pretty well.
My problem is the people who call or text with questions. They ask things like "does it have a generator?" Yes. "Is the WD hitch included?" Yes. Is it in excellent condition?" Yes.
They will text 3-4 questions and usually every one of them is a "Yes". Then I never hear from them again.
I guess if it didn't have half of what they wanted, they'd come and buy it right them.