Assuming you can't just tilt the camera down I would add a license plate backup camera. If you have an aftermarket stereo in the dash it might already be able to wire in the new camera. Otherwise a small monitor can be added fairly inexpensively.
I have this camera and like itan inexpensive monitorRun the wires into the coach and leave them under the dash or something. Then suction cup the monitor to the windshield when hooking up the boat and remove after. The camera has a 25 foot cable, but if needed an extension is fairly inexpensive.
RCA cable