I have been following this thread for a long time, and from what I remember (you can always go back through all previous 828 pages :-), the problem has been reported pretty much on any and all configurations, all the way from WT up to LTZ to Sierra Denali's. Regular, double and crew cab, 2WD and 4WD, steel wheels and aluminum, low profile tires (20+") and standard profile (17-18"), different trims (high country, etc)
No real rhyme or reason.
Lots of different fix attempts, some things have helped for certain people, some not. What works for some doesn't work for others.
Good luck!