We bought a 2001 Beaver 4 years ago with 32000 miles and very clean.
Caterpillar 3126B 330 HP diesel with a Allison 3000 tranny.
It needed tires right away and a new cooling unit, so I bargained the owner down a bit to cover these items. About $5200 deduction for that.
I had to replace mostly roof plastics i.e. vent covers, frig cover, ac covers.
The rv satellite system was inop and obsolete so we got a Dish tailgater.
Other than that mostly yearly maintenance and small things that just quit working...
I just recently had the dash a/c fixed, the rear wheel seals replaced and new thermostats put in, most expense we have had in 4 years.($3200).
We still love it and have put over 13,000 miles on it part time use.