I saw something similar about 8 months ago on RV Trader and couldn't quite bite on it, "...too good to be true..." I got an email from RV Trader about a week later that the rig turned out to be a scam and they hoped I hadn't gotten too involved. They wanted to use EBay to pay for it but not list it on EBay. The EBay Pay site looked legit, but it wasn't Pay Pal... EBay owns Pay Pal, why would there by another payment method?
This was a 2006 American Tradition for $35,000.
Could be a fun trip, just don't give him a dime until you see it...