Having issues with rear tire wear on a 06 G6 Sedan with 82K on it. Seeing heavy inside wear on the rear tires almost like the shocks where going out and not able to support the rear. The wear starts with the tread bumping up then over time wears as if the alignment was out. Fixing to buy new tires and want this issue fixed before putting them on. I saw this issue when I replaced the tires the first time and thought it was just the stock tire causing the issue.