grey2112,
Have you seen the rig yet? I don't know why but every time I see or hear "bought at an auction" I tend to be more skeptical of the vehicle. It's probably just me, but I guess I just think that if it was as good as they said it was, it wouldn't have had to be sold at an auction. But, I guess there are some reasons why it could be that are valid.
One minor correction, the chassis is an F53, not an F550.
Is this your first Class A RV?
Our rig is about the same age and our roof is in pretty good shape. BUT I have kept after it and have used eternabond tape on many of the roof penetrations and self-leveling sealant on the others. I wash it once a year. Proper roof condition would be a top priority and any evidence of leaks should raise a red flag or two. If the leak was tended to promptly, not so bad. But if not, be very cautious.
How many hours on the generator? Generators usually need regular use to keep the carb from gumming up, so low hours on a generator might signal that there could be potential issues in that area.
I don't know exactly what "updated interior" means specifically. We haven't done much to ours other than replace the old CRT TVs with larger LCD screens, and replace the refrigerator with a regular 120V household unit. But if a lot of renovations such as carpeting, upholstery, new ceiling, etc. were done, I'd be a bit cautious about that as well. Perhaps it's an attempt to hide something.
Repair to slideouts and/or leveling jack problems can ring up some big repair bills, so make sure they work properly.
Awnings can be replaced, but best if they were already in good shape. At that age, the main awning will probably need to be replaced, if it hasn't been already. If it has awnings over the slides, those, too, will probably be in need of replacement soon. We've replaced our slide-out awnings once already and will probably have to do it again next year. They get a lot more exposure to the weather than the main awning, which we rarely use.
Hope this helps.
Good Luck,
~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.