The only way you are going to get any idea as to whether or not the rig is of any value is to go look at it. It is going on 27 years old. What option could you possibly be interested in knowing about that couldn't be verified by 10 seconds of observation? Only you can decide if it will serve your needs. A test drive will also go a long way to determining it's basic health. If it passes the eyeball test and doesn't fall apart on the test drive you could have a mechanic check it out before shelling out the money.
My expectation would be anything that is original equipment is likely to die at any time. Look around your house to see how many 30 year old appliances and electronics you still have in operation. The ones in the RV weren't built any better and they have been bounced around for 62000 miles. Whether or not it is the vehicle for you depends upon your use and expectations. For me, a rig like that would be destined to be a football game tailgater, a hunting and fishing rig or a limp it to the lake to get out of weekend chores. I wouldn't rely on something that old that I had no idea how it had been maintained and treated to be my trip of a lifetime conveyance.