Any one with 15.5 LML have paint chipping and cracking behind back door window on both sides of crew cab? Mine is chipping all the way up the door. From online searches i see that GM knew about an issue with the paint on 14-18 year models. GM is denying me a fix. Truck is a 15.5 year model and paint is chipping off already. Truck is garage kept. Dealership told me they see this a bunch behind back door window and on top of truck right off the windshield. Let me know what you did and if GM fixed your issue.