Looking to buy 2022 LTZ 2500 with Advanced Trailering System. The dealer says the chip for the system isn't available but the window sticker says the option is on the truck. It is part of the price but not capable of all the advertised functions. They can't tell me what part if any of the functions will work now. They can't tell me if all the functions will work when the chips are available later. I want the truck but I need to know what I'm paying for and what I'm getting for my money. Any help will be appreciated.