Don, we just finished a 4-month search. Try these: www.rvtraderonline.com
, or www.rvonline.com
I always got responses to my inquiries about ads on this site - I think it was the best one. Some people don't provide emails, so you have to call. Some are a bit slow to answer (out on the road, perhaps?) But you might want to make sure you're pushing all the right buttons on your response (mechanically and linguistically).
By the way, until we found ours in Atlanta - a trade-in to a motorized RV dealer - we found almost nothing south of St. Louis... cleaned out. The supply is just now starting to come back online (in my opinion, but what do I know). We visited one dealer in Houston who said on the Saturday 3-weeks after Katrina, they sold 185 trailers in one day at sticker price - and they couldn't get more because FEMA had taken over their factory.
Good luck on your search.