My wife and I saw the unit again on Tuesday and we decided to pass on this unit. I had a tow truck and shop lined up to do the work. When we looked at the unit, it was missing the gen set, the muffler was split wide open, and the floor near the rear sloped down. I crawled underneath and noticed what looked like a plywood board screwed in above the differential (see picture).
This guy was holding firm to his price (I got sick of hearing "These are going for $10,000 on eBay") and it need WAY too much work (casting plugs, exhaust manifold, muffler, transmission service, differential service, belts, hoses, generator, house battery, rat/mouse pooh removal, paint, 16" rims, new 16" tires, new AC, new upholstery, and I'm sure much more). This is basically a complete rebuild/restoration yet he thinks he has a gem!
My other thought was that the board is a cement board as a result of the hot muffler right below it.
The missing gen set and the sag in the rear floor were deal breakers for me.