Uneven Tirewear
 

Eenin, all! Im having problems with every-other treadblock on both sides of all of my tires wearing faster than the others. I have noticed the rear driverside tire is 1/2" further outboard than the passenger side. My truck shakes at speeds over 40 mph. I bought the truck new and we've never crashed. Where do I even start?

Can you tell where the truck is shaking from or is the whole truck shaking

It's not easy to determine. There's no steering wheel shimmy, so my guess is it's coming from the rear. Also, my tires are rotated and balanced every 6k miles and it's been 500mi. since the most recent. The rear tires are especially clean on every other tread block as the front dont seem that way.

You don't use balancing beads do you? Worn shocks of shock bushings can cause it too

No balancing beads. Weights on both sides. Shocks WILL cause it most often. But, this sets only has 30k miles on them. Crap! Could they be done already?

Have you tried a reliable tire shop/a different tire shop my buddy is dealing with the same thing on his wife's car and its a balancing issue

What brand of tires

I've got the same problem but I have a bent wheel that's causing it plus I need new shocks I would have the wheels checked out for a bent one

I haven't tried a different tire shop. This is the same shop Ive used for years. I'm running Cooper Discoverer STs. Thanks for the suggestions!