They will be worth like any vehicle from 1984, dependent on condition
Has it been owned solely by one single enthusiast who has kept it garaged under cover, serviced the engine every year, habitation checks, gas and electric tests every year, done all repairs professionally, no awful DIY modifications etc etc
It could be a lovely, beautiful condition classic or a pile of rubbish.
The only old American Motorhome I would entertain if I was in the market
Is the vixen http://www.vixenrv.com/History.php
BMW Diesel engine and sensible proportions for European roads,
The rest IMO are gas gusslers and totally unsuitable for our road network unless you stick to A roads and above, what’s the fun in that?