I needed a backup camera for the coach. I don't know why it wasn't on by default. After reading reviews and watching install videos I decided to try a wireless backup camera from Rear View Safety. This turned out to be fairly easy modification. I was originally going to place the camera right below the center marker light above the rear window, but I stopped myself right before I drilled a new hole. It turned out the hole for the light was already the same size that I needed for the camera. The grommet fit perfectly. I think there's enough marker lights up there and not having the center one is not a big deal. I used the power for the light to power the camera. To turn the camera on I just turn on the parking lights.
Here is the link for the backup camera I bought:
Wireless Quad Camera System with Cigarette Lighter Adaptor
Here is what it looks like instaledl:
It comes with a suction cup mount. For now I just put it in front of the rear view mirror. I'm probably going to get a new mount and put in on the center console somewhere. Now when I backup I can see what I hit!
The camera picture is very high quality. This version can be outfitted with up to 4 wireless cameras. I haven't tried it at night but it's suppose to work well in low light.