I have extreme tow package on my 2017 that come with 5 cameras on the truck.
Trailer camera is additional purchase and you can have it alone, or with TPMS for trailer.
As above, not only Ford is not allowing you to use cameras above 5 mph, but the only way to activate rear cameras is by switching to reverse and then you still have to scroll the screen for bed camera.
I am waiting for smart guys to hack the system. The cameras are pretty good and I would love to have front working with recorder as traffic camera.
You can find my thread how I converted the tailgate camera for camper use
HERE