Bullseye!
Bought a backup camera for my box truck that is mounted in a license plate frame.
Problem is, the license plate is mounted on the far left edge of the truck.
So, I mounted the frame, with steel filler panel on the frame of the lift gate.
It works okay for hooking up a trailer, and making sure there's nothing behind me..... but I try really really hard not to have to back up, and if I do, I crank the wheels so I can see what's behind in the mirror.
I don't use the camera much.