AUX camera input Superduty: always live, at any speed?

On my truck I have bunch of cables with end caps on them right under the bumper where 7-pin connector is.
I believe 1 is for trailer camera, but there is bigger plug there as well and no clue what for.
You can turn the cameras manually even going forward. I do it quite often maneuvering the driveway curve.
The main switch is above the screen and then you use screen touch buttons to change between cameras.