I guess I would start back on 'choice of vehicles'. Start with one that doesn't have a propensity to self ignite.....
I agree with the diesel idea and, it sounds like you'll need a pickup to haul all the additional gear mentioned here :-)
I realize that option depends on how $$ capable you are, but with being way away from 'friend assistance' a lot of the time, reliability is a major issue, especially if you are chasing nuggets in the backcountry.
Let me reinforce that there is a LOT of good advice on this thread for any/all of us who venture into the backcountry.

gimpy

Have you looked at a 'Mog' (Unimog) by MB? There are older ones out there and they are 'anvil' reliable and available in diesel. (Spend your kids inheritance before they have a chance at it.) :-)
Of course parts are NOT available at NAPA, which is a consideration.....