I just recently purchased a new Ford F-250 which came with a backup camera. Well I had to remove the tailgate and install my 5th wheel V tailgate.
I thought it would be neat to have a camera that when backing up see the hitch alignment and would show in the backup mirror.
I puchased a miniture camera and tapped into the power and video circuit at the rear of the truck and installed the camera in my cargo box lid.
Simple wiring and in a few hours I had it done.
Here are the pictures.
This is the camera I purchased. LINK
If you want more info just ask.