We have a 1996 190 Versatile which was bought used in 1999. As far as the "Dodge" part of the Roadtrek is concerned, we have:
(1) had to repair the cruise control due to a "vacuum leak"
(2) replaced all four tires with Michelins
(3) replaced the brakes
(4) replaced the shocks
(5) replaced the fuel pump (which happened in Wytheville, VA!)
We still see many of these domestic Dodge vans still doing daily work. The 318 cubic inch (5.2 L) engine was one of Chrysler's best. Parts are still abundant.
The "camping" part of the Roadtrek has given very little trouble. We've:
(1) had to blow out the burner assembly in the fridge several times since "critters" like to make a new home there
(2) replaced the water heater anode rod about every two years, but we do clean it several times each year
(3) replaced the propane detector as they have a lifespan that's similar to a household smoke detector
(4) replaced the smoke detector
(5) replaced the knobs on the stove
(6) replaced the house battery three times. (We use an inexpensive flooded-cell maintenance-free RV/marine deep-cycle battery from Costco that has a rating of 95 A-h.) These batteries have served us well.
....and a new project that is being performed now is to enable the installed inverter to power the fridge on 120 VAC when driving, as the 12 V heater in the fridge recently burned out. (We try to avoid driving while the fridge is running on propane.)
Good luck with your new (hopefully) purchase. We LOVE our Roadtrek.
Jerry & Susie
1996 Roadtrek 190 Versatile (Dodge 5.2 L)