Whats the best way to search for a nation wide TC purchase?

Bought a camper yesterday finding it on rvtrader
This site will show mostly dealers, but that is who you want to deal with buying long distance.
I did email lot of private sellers from craigslist but they don't do good pictures, don't answer very fast.
Might work if you are in the area and can see camper next hour, but not for long distance.