I drove over 200 miles to get my 1990(Lance 9.6) barn find..It has never leaked to date and I have had it on some really rough roads..My lance 9.6 weighs 2679 pounds and it is fully self contained,some of the older models are not fully self contained,only partial.
Truck campers are totally over price these days so it will depend on the seller,if he is old school,you can get a reasonable deal,if he is the new breed,expect him to call it a classic and charge accordingly..
My last lance 8.6(1992) pictured below,cost me $2500 cash,as an example,fully self contained..