Rear view camera......I got one for when I tow my trailer. However, I am reluctant to drill holes in the motorhome body if I can avoid it.
I bought a cheap desk lamp with a strong clamp fitted to the bottom from Homebase and took off the clamp. This I attached to the camera and when I need the camera I clip it to the curtain pelmet and run the cable through the motorhome and plug in to the "monitor tail" below the dashboard.
On arrival, I make it all up and stow it away. It also keeps the camera out of the weather, and although rain on the rear window will cause some loss of vision, I can still keep an eye on the trailer and reverse if need be.