Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
The answer is "it depends". The biggest factor is what you paid for the unit when new. The biggest depreciation hit would be in the first year.
For instance, we bought our 2005 Safari 25FB in June of 2006 for $37,800. Right now, these models go in the $25-30,000, depending on condition. Condition is a big factor in the used RV market.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)