Based on the fiberglass RV 4 sale site, looking at sold
listings, that price for a 1988 is high.
For a reference, a 2008 16 footer in Gig Harbor sold
earlier this month for about that price. 20 years newer...And a lot cleaner. With roof AC.
With a 1988, appliances, axle
, and more are likely 33 years old.
The more you pay, the less likely it will maintain value at that price level. But FG trailers in general hold value well. Store it indoors: carport or garage. NW weather can be brutal on any RV.