I think that using CL eliminates a lot of people. I never look there for anything. I have window shopped RVs on rvtrader and camper wold and even eBay.. And always end up actually shopping and buying at dealers.
IMHO the dealer is the way to go, because most people need financing and of these people, most probably go through a dealer to get the financing (since dealers can shop around for financing from multiple banks/ etc). Also the dealer will be the one doing the marketing as well, so not your money and time on that ( or your time being spent on fielding questions and showings); seems to me that 10% is worth the price to not have to deal with the stress of trying to sell a large ticket item