back up camera

need opinions
I have a kenwwod dbl din touch screen in the truck wired for a backup camera
the camera for the truck already works great

what I need is a camera on the trailer
.......already have the truck wired for such a camera

need one on the trailer cause it's a tight fit at an odd angle getting into the gated driveway

I have eaten the fence corner more than once with the trailer guide pole

the thought is to mount a camera on the guide pole
so that I can tell how close I am to the fence and be able to back the boat in without a spotter
(it's a blind angle)

would you guys rather have a guide pole that doesn't rotate when the boat hits it when you drive the boat onto the trailer
or
a guide pole that doesn't float when you have to back the trailer onto a deep steep ramp?