The kit is listed on my rap sheet as "XFQ Mopar trlr Camera wiring/no camera" and it was factory installed ($590 option). The original 4 pin/7 pin on the bumper is still there and functioning. The kit added another 7pin port with the 12 pin port to a bracket mount below the bumper. So yes, I now have (2) 7 pin connection points on my truck, bloody brilliant.....jk
After searching many posts and Google, I have found the camera PN and to my disappointment, its an analog camera. Digital is not possible with this kit, VERY frustrating in this day and age. Not to mention, the camera kit (82216068AD I believe) is $650-700 if you can find it. In total, I would have a $1300 sketch analog camera, thanks RAM!
The ports are independent, the 12 pin is strictly for adding one or two cameras to your trailer and does not accept a 7 pin. This camera ONLY works with the uconnect screen and I believe it will show tailgate or aux camera when put in reverse.
Knowing what I know now, I would see where tailgate camera plugs in when tailgate is removed to see how accessible it is. If tolerable, I would purchase the much cheaper digital tailgate camera, come up with a mount and wiring to extend it to back of trailer and just switch plugs when towing. I haven't pursued either option yet and my towing season is almost over for the year.
PS, truck is at home so I can't get a pic of the plug here.