I just added backup cameras from Rear View Safety. One camera is attached at the rear of the fifth-wheel above the rear window, the other camera is attached to the bumper of the pickup just above the frame mounted hitch for my utility trailer. That camera does double duty when towing the fiver as I can monitor the underside of the fiver to include all four tires.
I installed the camera on the fiver mostly for viewing what is behind me while driving, not so much for backing up at a campsite. As I am really persnickity about routing wiring, I actually removed the rear aluminum, routed the wiring through the studs, and then reinstalled the siding. The rest of the wiring runs along the left side frame rail in split-loom tubing. The connection from the fiver to the truck is through a pigtail that attaches to a connector in the bumper. There is a seven inch color monitor on the transmission tunnel in the truck that shows a big picture of what's behind, there's even a built-in microphone that allows me to hear the DW giving directions when I do back the rig in.
All this for less than $300. Pictures to follow. Fifth-Wheel Camera System
Richard and Laura Ray
Amateur Radio W4RLR
"The Green Goblin" 2008 F-250 Lariat CC SB, 6.4 liter automatic, 4x4"Love Shack" 1995 Jayco Eagle 277 RBSS fifth-wheel