Rearview camera hardwired on fifth wheel

We bought a used 5th wheel that had 3 cameras. One rear view mounted on the outside above the full width rear window and the other two are side view mounted about shoulder high forward of the cross-over storage doors. Wiring for the rear camera is run across the roof being held down with Dicor, then enters the corner molding and hides behind the vinyl strip. From there, it follows the frame to the front where it goes into the front storage compartment. The other two cameras are mounted far enough forward that the wires go directly into the front storage compartment. From there, they are bundled and zip tied to the 7-way cable. On the truck, I drilled through the side of the bed near the 7-way connector and mounted three fittings that would mate with the cables. Inside the truck, i mounted a small 5" display and a switch that would allow me to select any of the three cameras. One thing to watch out for is that the camera actually sends a reversed image so that what you see is the same as you would see in the rear view mirror. Otherwise, it really messes up your brain.