I'm looking into adding a camera to the camper just for reverse operation. Traveling forward I can see enough in the side mirrors (even though I don't have foldout tow mirrors) by leaning slightly and also by using the window in the camper door.
What I'm looking into is getting an OEM camera and the wiring harness that is inside the tailgate. My truck came with a rear camera so my intention is to unplug the tailgate camera like normal when I remove the tailgate. I'll mount the additional camera on the back of the camper and just plug in the harness to the factory plug in the truck. I prefer not to have an additional monitor in the cab.