Hello I just read the problems you were having with your truck I have a 16 Denali 6.2 8spd I’ve the same issue as yours it shakes under light throttle from the get go I can feel it in the steering wheel as well ,,,did yours shake at 70+mph ??? I’m very frustrated as I’m not in the states my truck was imported from Dubai To another country so the parts availibilty is limited.... I did however balance the tires which improved a little but not completely eliminated.