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

Beware of lot of bogus sites.
I run into one, that had dozens of listing, but most of them "over 60 days old"
I emailed about 10 for update and got 0 response. Email the site support what is going on and got 0 response as well.

There isn't one source. Besides rvtrader, craigslist, offerup, and any search engine.

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.