To determine the blue book value you can use NADA Guides, but will need to first make sure you have the correct model of Keystone Everest 5th Wheel.
Plus double check all options specific to your recreational vehicle. Here are instructions to follow for finding the blue book value:
Select = [RVs]
Manufacturer = [Keystone RV]
Year = 
Model = [Everest Series / M-364 Q]
Options = [Select]
[Get Base Pricing]
Low Retail = $9550
Average Retail = $11500
There were ten models of the Keystone Everest manufactured during 2004 ranging in length from 32 to 37 feet.