Wow, 336k is impressive - my tow truck friend know of 2 that had over 300k.
I just bot a 2010 w/220k from original owner, traveled a lot, my friend did all the service on it and told me about it so I got it.
Original engine/trans (knock on wood), some wheel arch rust, not terrible, tailgate bottom gone, but found nice one in UPull&Pay. Rockers bad but inboard wall appears to be ok - the double inner/outer rockers are shot. I can weld and also got the rust repair sheet metal from UPP.
UPP yesterday had $5 Radios and Speakers, so I took Radio & subharness, Door speakers, Sub Module & trim cover for a 2008 Mariner for like $45 total. However I'm not sure if it will work in the 2010. I've looked at over a dozen in the yard and this was the only Premium/Audiophile Sound System - never saw a Navigation one either.