Hyco

My 2015 2500 Denali HD has a bad vibration also Dealer tried to fix even went as far as to putting a new set of Michelin on ,did not help.Went to several dealerships and drove 2015 2500,s all have same problem had a 2007 2500hd Denali no vibration Truck sucks only problem is I been driving GM products since 71. also headlights are horrible can't see anything at night very unsafe any suggestion