With my 2019 F350, I have described how the system works by stitching the cameras around a graphically generated vehicle.
And pardon me all to hell for attempting to make a useful post. Yes, with the camera system there is an additional camera connection available at the rear of the truck. It is hidden above the spare tire on the passenger's side of the truck. It is an extra camera port meant for use with a trailer camera. When you select the camera icon on the LCD screen, you have an additional camera icon available for that camera. As you have pointed out, there are systems available that will trick the 360 degree system into using the additional camera in place of the tailgate camera.
The question would be - how does the system deal with a different camera location and field-of-view when it attempts to add that camera to the 360 degree view?
