We did a similar deal when we got our Georgetown. The seller was the original purchaser from new and had taken excellent care of it. At 8 years old it only had 12,000 miles on the clock and 48 hours on the generator.
Driving it home, the ride quality was awful - lots of tire noise and harsh motions.When I looked more closely, I found it had the original Goodyear tires on it, dating from the chassis manufacture date of 10 years earlier. That was fixed quickly at our local Les Schwab store.
The other thing I missed was the slide topper. The rig had been parked at the owner's house with the slide extended for the best part of a year. The slide was facing south. First time out for us was a rainy weekend. When I unloaded at home, I found the dinette cabinets all wet inside. A closer look at the topper showed it was rotted out, with only the structural net remaining. I built replacement cabinets, using the original outer frames and doors, and had both slide toppers replaced.
In our 3rd year with the rig, then 11 years old, the fridge died the day before we were leaving on the three week trip. No time to get it replaced before we left. We must have stopped at every Fred Meyer store on the Oregon Coast for ice! We gave up after two weeks and headed home. New fridge installed - $1500.00!
Before the end of that season, the generator went bad - wouldn't start. We rarely used it, being FHU "campers" so I didn't get it fixed. When we sold the rig on consignment at the end of our 4th season, the dealer fixed it - not for free, of course. It needed a new control circuit board.
On balance, it was an expensive experience, but a good one. When we realised we were taking money from our IRAs for the lifestyle, we decided to shut down.