I've got an '02 Z-71 w/ about 27,000 mi. on it. At somewhere between 25,00 and 26,000 I started to get a lot of road noise and the Av began to get squirrely in the rain or whenever the tires got wet (even coming out of the car wash). It appears that the tires (which I hate anyway) have plenty. of tread left and are only now down to the first tread block that connects the outer 2 tread rows I rotated them, but there has been no difference. Has anyone else experienced this? When have some others gotten rid of these tires?