Ok. So I am following this thread, but I got lost along the way. Lol. I have just purchased a 2020 GMC 2500 AT4. I am having a trailer built and I need to get the cameras ordered to supply to the trailer builder. I want one in the inside of the trailer to see the contents. As well as one on the back to use the transparent trailer view. Two dealers that I'm working with tell me that the cameras are not available to order through GM yet and there is no date as to when they will be available. Does anyone know a part number of the cameras I need to order to make this work so I can get them to the trailer builder? Any help would be very appreciated. I can't anywhere with the dealers. No one seems to know anything about it.