I ran into the same problem on my 2021 Redhawk 31F during mid-trip cross country. I finally got a cheap $15 rear camera from Walmart and got the trailer light wires (25 ft) and ran it all the way to the back of the head unit in the dash. I used a 7 pin plug battery charging and ground to power the camera since it was already back there. This was a temporary set up until I got back home.
Since then, I ran the camera wires down through the emergency exit window into the coach, ran the wires all along inside the seal of the slide and into the back of the radio. I discovered the 12V+ switched for the rear camera module and used that instead.
I couldn't fully remove the dash bezel to see if the module is back there because the radio won't come out all the way, but just enough to access the RCA video input. I tried to fish tape the wire in the wall, but it was impossible due to the PS foam obstructing it. I just will conceal the wires not in the seals with those things you find at Home Depot to hide wires along the walls.
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