I doubt if they ran the wiring harness for the camera, which would need both a signal and power cable. Besides, the camera and monitor you add will probably have their own unique cables and connectors on each end. They are seldom standard video cables.
Just drop the camera cables down behind the rear cap, then under the coach to the front and in through the floor or firewall to wherever you mount the monitor.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL