I think the big difference is weight. My 98 weighs 7100 lbs with the 12V putting 975 over the front end. In addition I have a 250 lbs of "Critter Getter" on the front. Even rotating the tires I can watch how the fronts just take the brunt of the wear on mine.
I bought one set of new tires back in 01 "Firestone AT" and got 13,000 out of them. It does not get a lot of use these days so I just need to buy a set of used.