I think having to pay off the Mexican cartels and border guards and all the other gorilla brigades that own different sections of the road all the way down will cost as much as fuel or more even.This will happen a lot.Aside from that I think it would be an incredible trip.
That bronco was on craigs list for awhile about a year prior to that. I remember getting a PM from the person about it. I actually almost picked it up. IF I remeber right it was super cheap and in awsome shape.