VehConfig 8 off road camera is for the Jeep gladiator trail cam system. It requires the same type of central vision processing module as the surround view system, and uses digital cameras. It is also used on the power wagons with surround view, and it puts the dynamic tire track gridlines on the front camera screen.
2020 HD Rams have two analog aux trailer camera inputs available- pins 21&22, and pins 24&25. This is only possible if the truck is not using the VehConfig 1 CHMSL camera setting. I’m not sure if a 2019 DT truck is capable of one aux camera (let alone two), but if you want to try, you would disable VehConfig 1 CHMSL camera, and enable VehConfig 8 auxiliary trailer camera.