Back-Up Camera

My 2012 F-350 has a rear-view camera in the navigation system screen. It's great when backing and a great safety feature. But, it only works when the truck is running and in reverse.
I would like an option to turn the camera on while in Park.
This way, I can stop the truck, put in Park, set the brake, and watch as the crew connects the trailer. When connected, I can also see that everyone is out of the way before i switch into drive,
It seems like this could be a simple fix - maybe by using one of the up fitter switches to activate the camera?
Brian P 10/18/2013
I'd love to be able to look at the hitch without switching into reverse. While driving or, as said, while in park.