I had a bad connection on my 2015 FR3 30DS right side camera that I traced back to a cable near the radio. I fixed that. Additionally, the picture quality of that camera has not been great, and I noticed this weekend that it is completely blurry. Found a replacement at
www.Surveillance-video.com. It's an RVS Systems RVS-MV1 480 TVL MV1 Backup Camera that can be used as a side camera, as well. I believe you disassemble it and rotate the camera in the housing for a side view. It has a threaded extension that goes through the body of the MH. Here is a link to the camera:
https://www.surveillance-video.com/camera-rvs-mv1.html. I'll let you know how the install goes!