The secret to covering a lot of ground fast on craigslist is having links to each of the regions.  This page puts all the links at your fingertips and searches just for motorhomes.

Armed with quick access to lots of listings, you can use the RVT free rv price checker to help decide if it's a deal or a dud.  Find the lowest, highest, and average asking prices for RVs currently listed for sale at RVT.