I just replaced the backup camera in my 2011 Sunseeker 3170DS. My camera looks exactly like yours and seems to be a factory install.
We pulled off the top panel over the bed, and found the S-video cable from the old camera there. The camera was full of water, and the display was inverting the crappy picture we were getting (which was so bad it was worthless). The short cable on the camera was hooked to a long cable that ran all the way to the front of the cab where it hooked to the display. We disconnected the camera and the display and removed both, leaving the S-video cable where it was. I know that you have probably solved your problem long ago, but I thought I would post that the short cable can be hooked up to a longer cable inside if you pull off that top panel in case someone else had the same issue in the future.
As such you can just replace the camera if you pull that panel and disconnect the short cable on the camera. Because the camera and the screen both had some issues, we decided to replace the whole system and upgrade to a GPS as well.
We bought a Garmin RV 760LMT BC20 Bundle for about $400. It is wireless between the camera and the GPS display. We ran the cable for the transmitter through the previously made hole used by the old crappy camera and hung the transmitter behind the panel that we removed and then put back after installation. All works great. I had to tap 12V power from one of the running lights up near the roof. That works well as the camera is only powered on when the running lights are on. If you want to turn the camera on during the day, you can switch on the lights and the GPS senses the camera coming on and switches to it.