I just bought a 2020 GMC 2500 SLT(really good price) but it didn't come with all the fancy cameras. I would love to add the trailer camera but the truck doesn't have the 2 plugs above the 7 pin plug. I assume this isnt going to work but I wonder if I can buy the oem parts and just add it. But I bet the BCM controls it. Wish I could add all the cameras