Correct, the dealer told me that they have been informed it would not get built. Seemed a little weird to me, but I work for a heavy truck dealer and many things have changed in the last couple of years. I should also comment that I know the GM of the dealer I'm working with and I hope they wouldn't do me wrong. It shows retail on my paperwork, but if it wasn't submitted as a retail order they would be asking me to remove adaptive steering and the spray-in bedliner too.
As far as installing the option after the fact they are going to research a part number and price to get back to me. Working at a dealer myself looking this up usually requires finding a VIN that had the option from the factory to locate part numbers. I really wanted it from the factory but am fully capable of doing it myself as I have a hoist and all the necessary tools. The downside will be having to cut the bedliner around the bed mounting bolts to remove it. Just want to make sure that the kit they look up is complete. It needs to include hardware/brackets, factory harness, and bed sidewall passthrough/plugin. In the build data selection, it references 12/7 pin ports. I believe the 12 includes the trailer tire pressure monitor wiring which I plan to utilize.
Really hope this doesn't turn into a mess...