I just bought a 2000 Sahara in excellent condition inside, 2 year old tires, really good outside, working diesel generator, 1 year old air conditioners, new flooring, roof sealed 6 months ago. Paid $13K. (just giving you a reference)
The only surprises after I bought it were a fuse that rusted in the slideout system (grrrr) and now I found an electrical issue in the engine (corroded cable somewhere).
If you have Hydraulic over Hydraulic brakes plan on new front calipers and pads.
The build quality is way better than most of the other comparable coaches.