It's really hard to say what the vehicle is worth since it's sight unseen.
Knowing the era of the camper van, I would say that the fridge is shot since most RV fridges at that time have a life of 8yrs at most.
The vehicle AC and the AC if the camper has it is more than likely R12. So that's another bummer too. The propane tanks are not the latest OBD type, so they will need to be upgraded.
Other than those items, if the inside is in great shape after the cleaning and the body of the vehicle is in good shape, you might be able to fetch 2 to 4 grand for it. The color and trim of the vehicle will also rate the value too. Most of these units were blue trim or brown trim on white. Does yours look something like this??? Here's the url as a person restored it ... http://www.birdsongguitars.com/chinook2.htm
This one in the pictures was shown on the history channel's 2001 great race.
The 5.9L non-magnum ear engine is a plus for that vehicle. The 5.9L would be alright for fuel and power if maintained well enough.
The tranny might be a 727 type. It was very popular in those days for Chrysler. It's also a dependable tranny too. If you change out the cap-n-rotor, make sure it's those parts have copper/brass contacts. It may cost $2 or $5 more, but will pay itself back in the first tank of fuel! The cheap-o aluminum cap-n-rotor are just that. cheap-o.
Does the camper part of it run on 30amp or 50amp shore power hookup?