@Rally6.2RST
You said you were successfully able to add the cross traffic / lane assist features, correct? What about the Super Cruise controls or whatever GM calls it? And, did you have the dealership install it or did you do it yourself?
I just bought a brand new 2022 Chevy High Country 2500, but because of the chip shortages it doesn’t have lane assist or the fancy cruise control. It does have the parking assist button installed, but it’s missing the chip so it’s deactivated. I do have the 360 cameras though, which I assume includes the windshield cam.