I dont know if any other coaches have this problem, but our '08 Georgetown did. At night, when putting the coach in reverse, all I could see in my rear monitor screen was the bright glare of the backup lights. Mine protrude from the bumper just enough to shine directly up at the camera. Found these stainless steel lens visors on ebay.
The pics below should show how easy they attach to the lens. I was prepared to tweak the shades if needed to fit my lens, but they fit just like they were made for this very purpose. I used the foam type sticky tape that is available at the parts house. Now when it is dark and I back up, the rear vision camera is functional....!