Help pricing this rv?

My gf and I went to look at this rv and wondering if it’s worth its asking price. It’s a 2011 coachmen freelander 21qb for $35,000usa. 66k on the engine and has been fully remodeled. Generator didn’t start up on showing but has 600watt solar installed with a 100amp hour lipo lithium battery. Also a 16 gal propane tank to run appliances. Some rust underneath and seals have been caulked from the exterior, needs a paint job, and the rear dually tires seem to be a lil dry rotted. Seller seams very transparent but we feel the price is a little steep. Drives great and shifts smooth. We don’t want to insult him with a low ball because of the labor and parts he has put into it but what do yall think it’s worth?