I just changed out a set of old style 285-75-16 Good Year MTR's last year. They were used, and came with my D-90 when I bought it. I put 40k on them, they wore evenly and had so much life left in them they are now on a buddies 4-Runner. I always ran 32 to 35 PSI in them on the street, 12 PSI on the trail, they were mounted on 16 x 8 steelies. I had them siped, maybe that had something to do with the exception wear... they were the best MT tire I ever owned. I looked all over for another set, ended up with KM2's.
I would at least have the toe-in checked, these MTR tires wear like iron.