Allow me to open the door and drive the car backwards!

Make the camera go off and on instantaneously whenever it is in reverse.

I second the trailer hitch opening improvement.

Since the running boards serve no real useful purpose other than aestethics, make them operate opposite other power driven running boards; i.e. they retract when you open the door! And since they would retract, then they should be made bigger so they could actually be used and in this scenario, their retraction would be a driver selectable option so children and others who deem them useful could actually use them.

Let there be constant 12VDC at the rear power port.

Provide a 110VAC plug.