Got 46k miles on my Denali 1500 4wd Duramax and it is the same thing. Truck spent its first 22k miles in Canada before I purchased it. I baby it and do minimal gravel and trail for hunting only. 4 wheel alignment had camber of 5 degrees both sides and caster off as well. They adjusted lower control arms and such to adapt but it still wouldn’t get it in normal
tolerances. So having to replace arms.