back up camera

I commented to my wife that it would be nice to have a camera on the back of our trailer. I could use it while backing up into a site or just to see behind the trailer while driving. She remembered that I already have a GoPro camera that can be displayed on my iPhone or iPad through blue tooth. I just need to attach one of the GoPro mounts to the back of the trailer and I would be good to go. I didn't even think about that option. Great idea and I already have everything I need. The camera can easily be put on or taken off the mounts.