I have the mirror mounted monitor, purchased from an ebay seller, wired with a plug for a dash power outlet. Since the power outlet is always hot, the monitor and cameras are powered up, anytime I plug the system in. The monitor has two video inputs and a remote for switching between cameras. I wired the truck, through the firewall, down underneath, and back up into the tailgate area, with about 15' of extra cable length. The cameras, cables, and monitor, all have standard RCA plugs. I did have to modify the power wiring to use the dash outlet.
I have four cameras (all from ebay sellers) for various functions, all with cabling that allows me to plug in which ever views I'd like to use.
1. Camera mounted on rear of truck camper (cabling from tailgate reaches this one)
2. Portable camera set on truck bed rail for loading / unloading the truck camper (uses cable from tailgate).
3. Portable camera with attached clip (clips onto the license plate), for hitching up travel trailer or utility trailer (uses tailgate cable).
4. Camera mounted on rear of travel trailer (trailer is wired to the tongue area, where tailgate cable plugs in)
As a norm, I am alone when loading the TC or hitching up trailers. Without the camera system, hitching up the utility trailer with truck camper loaded up, would be a real challenge. Two of my cameras have a line grid in the video, that not only gives an indication of distance to an object, but also, how squared up you are.
Tip for mounted cameras:
For rear view on back of a camper, mount the camera high as possible, angled slightly down, and preferrably with some type of glare shield. Mounted low and without a shield, increases the amount of time per day, when you'll have nothing but sun glare, or, night time headlight glare.
18 Nissan Titan XD
12 Flagstaff 831FKBSS
Wife and I
Retired Navy Master Chief (retired since 1995)