Sorry to hear that you are having similar problems with your rearview camera system. I don't know how far you have dug into the problem, but your issue is most likely being caused by a bad connection where the camera pigtail interfaces with the video cable that runs from the front of your RV to the back. If you carefully remove the existing camera, you might be able to gently pull out the interface cable until you can gain access to the cable connectors. If you can get this far, just tighten the connection and wrap with electrical tape and hopefully problem solved.
If the cable is too tight, then you're no worse off. Assuming that you're out of luck, any new camera and transmitter will need 12VDC power, so you'll have to figure out where to find that in the rear of your RV. I was able to punch through the rear wall into some cabinets. From there I got power from some undercabinet lights. Power for the receiver shouldn't be too hard to locate as there is power all over the place under the dash.
There is a link to the wireless transmitter and receiver that I purchased below:
https://www.ebay.com/itm/383851514921
I purchased this unit because it was low cost and I didn't know if it would work or not. Unfortunately, the camera I used is no longer available from the vendor I chose. The camera was part of a camera and display system. The display was to take the place of the radio display. I ended up just using the camera alone. My solution isn't ideal. The image breaks up a little from time to time, but it's useable. Doesn't bother me enough to want to go through the effort to find a better solution.
There are many vendors who offer wireless transmitter/receiver pairs and cameras on Ebay. I'd just go through the current offerings and pick one that has enough range for your RV (probably over 40') and will easily interface with the transmitter you pick. The receiver portion will plug into the radio's analog camera input. The digital high def. camera input will only work with the Xite camera.