I have a 2006. f 350 with a backup camera near the bumper, the monitor I use is an Android head unit, works great put the truck in reverse up pops the back up camera.
I wanted something I could monitor behind the camper, my camper also completely covers the license plate area. I bought a cheap camera on amazon, and installed it over the door of the camper, I connected this to a wireless transmitter (wifi) and use an old spare smart phone to receive the image. I can monitor the area behind the camper when the camper is on, when its off I use the camera on the rear bumper, its two separate systems. The wireless system is so easy ,hooking it up is a non issue.
I hard wired the camera to the transmitter and placed the transmitter as close to the Cab of the truck as possible, no lag, no problems, receiving the image on the phone. Put a switch in the system, when I get ready to leave on a trip I turn on the switch its powered up and the image is sent until I shut the power off.
I use one similar to this one, but there are tons of them available, this one works for me
https://www.amazon.com/Youmei-Backup-Realtime-Transmitter-Andriod/dp/B072Z478JV/ref=sr_1_5?crid=3V2IEBZ2VYXV4&keywords=wifi+transmitter+for+backup+camera&qid=1582243601&sprefix=wifi+transmitter%2Caps%2C341&sr=8-5#customerReviews
