2016 Jay Flight 287 bhsw
Craigslist, or an RV specific selling site. Either way strangers will have to come look at it. If there is a parking lot or park-n-ride nearby he could park it there with a sign also. If he doesn't want strangers at his house have them meet him at a parking lot or something similar. I've sold many things on craigslist and have bought a few things too.
2017 JayFlight 28BHBE
2014 JayFlight Swift 264BH (Sold)
2007 GMC 2500 Sierra Classic Crew Cab LBZ Duramax / 6spd Allison