GMC AT4

I found it real easy to run the tube up from the bottom to get it in place

My experience with metal is that it will crack when it is flexing over and over. We call it "oil canning". If you are going to keep the rack I would find a way to beef up the areas that the rack is attached to and the areas the are flexing/cracking. Good luck?

I have stock 20s which is a 275/65R20. I am going to run them for now

That's the height that I am looking for. Plus I have airbags in the rear. You just adjusted the stock keys? And did you need to have it aligned after lifting? Hopefully the ride is the same? Thanks,

On my 2020 AT4 2500 the steering is off a few degrees to the left. It doesn't seem pull one-way or another. It was that way with the factory 18" rims/tires and with my 7 year old studded rims/tires left over from my 2013 Denali. My dealer said that they will check on it when I bring it in for the first oil change next month. I purchased a set of set stock 2020 20" rims/tires and will put those on the truck prior to taking it in for repair. Standby for a report. Thanks,