[HUM GOOD]

I chose to use a 3" monitor mounted to the overhead consol. I went from the positive through a switch. I wanted to have a switch because at night the headlight glare from behind tends to get alittle annoying if peeps are riding on your butt.
I also put a camera on the back of my enclosed trailer. Ran a loop off the rig camera, which when I plug in the trailer it becomes dominant and bingo, now I can see behind my trailer.

This in no way interfers or connects to the nav systems screen.