Thanks Chuck. Yes, the side cameras work, just not the rear.
From outside the coach, I see there are screws of some type for the rear camera. I will take it off and see what the connection looks like and clean and grease as you mentioned. I'm doing the CHF and bushings right now. When I get done with that I will look into the camera, hopefully today.
I emailed the company for a manual, we'll see what happens there.
I'm open for thoughts if you have some. Thanks gang.