Autotrail Comanche Reversing Camera Overide

Hi All, having recently purchased the 2012 comanche autotrail with the pre installed media pack and reversing camera would like to know if anyone knows a way of viewing the rear of the vehicle without putting it into reverse.  The reason being is that we tow a car and obviously with the length of the motorhome with the car I would like to make sure that when passing through gateways or coming out of turnings that i have allowed enough room. We did have a cheyenne before where i fitted a rear view camera which enabled me to see the car at all times but having looked at the wiring on the comanche can't see an immediate way to bypass the wiring so any suggestions would be a help. Many thanks in advance