I guess what I'm saying is the center may wear out of your tires from overinflation..
Tires have a max psi on the side. Thats not the pressure that you keep em at. I don't even keep mine at 80 psi with plow on the front and 5000lbs of sand in the rear. I think I do 70/70 in winter. I'm running bridgestone revo's Load range E..
Maybe your pressure gauge is off a bit LOL..


Dick

 

LOL yep. Bought it off the Snap-on truck who knows... I have run...Sry I have wore out some Commercial T/As, Firestone Transforces, currently I have Dunlop AT Rovers with a 60k mileage warranty. my wear pattern as far as across the tread is great. mine just gets choppy like a front wheel drive car back tires do when they are not rotated.

 

Hey, I know what the problem is. You have the Snow Plow package. I have the exact same problem with my DRW F 350. They come with Wicked Heavy Duty Computer Tuned springs, and the Camber is set for more of a positive camber, from the factory. This is to offset the heavyweight of a 9 foot Snow plow! That is why your front tires are prematurely wearing on the outside, and causing steering wheel shake. You need to rotate your front tires to the inside rear tires. That way you will get more out of them.