In my years of dealing in this racket the two new coach options I found consistently make a difference in sale price and trade in value are Full Body Paint and Hydraulic Leveling Jacks.
To see what used units are selling for go to RV Trader or the NADA RV guide.
RVTrader.com: RV Sales - Class A, B, C Motorhomes, Travel Trailers, & Pop Up Camper RVs For Sale
RV Prices, Values & Reviews - NADAguides
The NADA guide will allow you to add options and get a general value for those items.
Thor Forums
