Truck has been through 14 tires and GMC still says it's the tires but refuses to do anything about it. Moving past that, their corporate office has treated me like a slug who was stupid enough to spend $45K+ on their defective POS. Attorneys have told me that GM only does something when sued and even after that they still have a bad habit of not fixing things unless a court forces them to. But remember, "At GM, we pride ourselves on ensuring an exceptional ownership experience." (direct quote from General Motors). Don't buy their products because if you ever have an issue, you become nothing more than Mr. Nobody to them.