I just bought an install this unit in my truck. I already have a back up camera on my truck and on my trailer. So I mounted this camera inside the trailer. I use a toy hauler so the camera can watch The motorcycle in the trailer. That way when it comes detached and destroys the inside of my toy hauler I can witness it.
But in my Opinion The camera picture quality is rather poor. The $20 cameras I am using on the truck and the trailer are far superior. The Garman camera is very poor in low light.
I found the GPS and the camera as a package on sale for $379. Do a search and I'm sure you can find the same deal.