Probably the most important thing is to check for water leaks inside. If evidence exists, probably good to pass this one by unless you're 100% sure the problem was dealt with promptly and solved.
Make sure the floor plan is what you want.
If they have maintenance records, that's always a plus.
By "vortec" I'm assuming it's on the Workhorse W-22 (22,000 lb. GVWR) . If it's on the W-20 (20,700 lb. GVWR), that might be a bit light for a 34' motorhome. The Workhorse units came with an Allison transmission, which is a HUGE plus over the Ford offerings at the time. Workhorse chassis were not as common because they had an upcharge of between $3k-$5k over the Fords at the time. In my opinion, the Workhorse was a better chassis at the time, as evidenced by the rig in my signature!
๐If it has slides & levelers, make sure they work as they are supposed to.
Most other things can be replaced or fixed. It's not new, it's 16 years old, so judge it accordingly.
Can't say much about Damon as a manufacturer. My uncle had one, a late 1990's model Class A, and he mostly spoke highly of the rig. The old Ford chassis left him wanting on hills and maneuverability, but the house part was pretty good.
Good Luck, let us know what you found.
~Rick
2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (27-Angel since 2008), 1 girl (22), 2 boys (23 & 20).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.