I bought the truck new in oct. 2015. It had a slight vibration in it while driving from day one, I didn't think it was bad enough to complain about, but it got progressively worse. Now that the tires have 1800 mi. On them its really bad so I decided to let the dealership know. They road force tested the tires and found that all 4 tires needed to be changed, they were bad from the factory. Not a problem, but I had to pay $100 because gm pro-rates the tires after 12, 000 mi. If I had known this I would have taken it in sooner for repair. The dealership said this has been a common problem with these tires, but I didn't know that..! I should have been notified by a bulletin of such problems and given a heads-up just in case I got some of those "lemon tires!" I had to take it back a second time and have them re-balanced because some of the tire balance weights fell off..! I am requesting a full refund of $100..