Our fifth wheel came pre-wired (Furrion mount) but the power was always on to the camera. Not wanting the camera to fail prematurely, I switched the power lead to a wire for the running lights at the top of the rear of the trailer. Now all I have to do is turn on the running lights on the truck and the camera comes on.
That being said, I find these wide-angle rear view cameras of minimal help backing. My wife with a two-way radio is much more useful. On the other hand, since I have a full-time rear view monitor and not just a backup camera, it's some extra assurance knowing when it's safe to pull back over after passing a semi on a mountain pass. In the long run, the best thing to do is get some orange cones, go to a big empty lot, and practice, practice, practice.
Rob
U.S. Army retired
2020 Solitude 310GK-R
MORryde IS, disc brakes, solar, DP windows
(Previously in a Reflection 337RLS)
2012 F350 CC DRW Lariat 6.7
Full-time since 8/2015