Seems like it's a common problem with RV systems. Although I don't have my new coach yet, I can tell you that this problem existed in my last 3 coaches.
Seems like the manufacturers do not use day/night vision cameras. As a result, the camera cannot really adjust to the darkness. Then, when another vehicle's headlamps shine, the camera goes all crazy trying to adjust to a bright light against a black background.
This must be a "cost" issue. In my 2014 Ford Fusion, the rear view camera shows a clear picture at night. It does get a little confused if a headlight is shining on it, but in general I have a clear, bright picture at night. So the technology is there, but maybe the coach manufacturers use a cheaper type of camera system.
Out West Somewhere
2016 Sunseeker 3050DS towing 2006 Hummer H3