Simple mod that gives me a rear view when the camper is on the truck. I mounted a cheap reverse camera below the camper porch light, then wired power to the camera from the porch light. I swapped the original porch light with one that has a switch on the housing so I can keep the camera power on but switch the light off while driving.
I wired a 1.3mHz video transmitter to the same porch light circuit and mounted it on the inside wall adjacent to the porch light and camera.
The 1.3mHz video receiver is mounted behind the dashboard and I use an adapter to get it to show on the factory display monitor. The adapter I use allows me to toggle between the factory apps and the video display on demand. It's a cool setup that I have used on a few different rigs. Since its wireless, I have a similar camera/transmitter on my pull-behind camper too. The dashboard video receiver picks up the signal from whichever camera is transmitting so regardless of whether I'm towing the trailer camper, or just the slide-in truck camper, I get a rear view. It works awesome for backing the trailer up.