I have a 1986 Sovereign
, a little newer but a trim line lower. Everything works and we spend six months a year in it. I would be happy to get $8500 for it if I was going to sell it.
Condition is everything to a willing buyer -- your potential purchase likely needs axles, especially if it has sat for a long time. It probably has numerous leaks with resulting floor damage. The appliances are old and likely in poor shape after sitting.
If you are looking for a project, well...
If you want to go camping, maybe you should keep looking.