Craigslist seems to be the necessary evil in my experience (other than the worse evil of trading in, that is). I find a descriptive well written ad it key to selling anything on Craigslist. I know as a shopper I'm pretty put off when all someone takes time to do is write two sentences. With RVs and trucks I've had great luck by writing accurate, descriptive ads that let people get to know the vehicle and your care/use of it.
Dealing with scammers? Well, that's kind of part of life anywhere these days. Google is your friend. Start entering phone numbers and email addresses of everyone you deal with. This can quickly let you know if their story adds up. I've also told people I expect to see a copy of their driver's license upon first contact and I'm happy to share mine. Of course, people don't have to share that if they don't want to it's a HUGE red flag if they refuse for some reason.