Just bought my '85 Westy full camper for $7500.  No PO records (sat outside
at a shop for 18 months after the PO gave it to the owner in lieu of paying
his bill) 139k miles, runs strong, AT, AC, PS.  AC not working.  Came with a
set of Carat wheels with decent used tires too.  No rust, and clean, but it
had the entire rear quarter panel, hatch, and valance replaced at some point
and was resprayed, but amazingly has virtually no dents.  It has a lot of
deferred maintenance though.  I have spent about $2500 in parts for it so
far, including new top canvas, complete brake system replacement; fuel
lines,  gas tank, sender, and reseal kit, new battery, propane regulator,
replacement lift bar and gas springs for top, and numerous other camper
parts, including GoWesty hookups, Sureflo faucet kit, and some used parts.
I hope that's it for now!  Oh, and the front table is missing.  $140 at
GoWesty--maybe later.

Next comes an engine swap for $10k or so.

Adjust your price accordingly.   I'd say start at $10,500 if it's a full
camper in good condition, and more if it's really pristine.  I looked at a
couple for $15k, but they were overpriced IMHO.  You can always sell it to
GoWesty!

Good luck--

Stuart in Seattle