I did think about this, but the 12 pin connector is totally separate if I'm correct and is used for the Trailer Surround cameras which are analog feeds to the Uconnect screen. I think the Trailer Tow offering has different connections that go directly to the rear view mirror. Hard to say until someone gets one of these.
At least, this is what I gathered reading some previous posts by
@Jimmy07
The mirror will definitely have two coax cable connectors for switching between the two cameras, and the truck will need to be prepped with the tow mode camera coax going to the bumper. I discovered the PCB for the 2021 digital mirror is actually prepped for the tow mode camera-

The question is, is the tow mode camera coax cable automatically run back to the bumper or rear facia harness when equipped with the digital mirror regardless of whether the two mode camera is optioned. Then, getting the connection to the trailer- not that Ram hasn’t done some mind boggling things before, but it would be a head scratcher if they didn’t utilize the 12-way connector. That would be a third trailer to truck connection if equipped with trailer surround view and tow mode rear mirror camera. I’m sure they’ve had all the pins on the 12-way designated since they first put it in use, and the way I would think the designations are is:
Aux camera 1 is three wires for the camera output, which also doubles as the trailer surround view CVPM output when equipped.
Aux camera 2 is three wires for the camera output.
The trailer surround CVPM will also use four other pins- power, ground, and canbus IHS HI/LO, with power and ground pin locations doubling as the power and ground for the two aux cameras.
Then the remaining two positions for the digital tow mode camera signal and shield broken out of the coax cable.
At least, that’s my best guess, but we’ll have to wait and see.