Back-up Camera Failure

I replaced the original 5" B&W monitor and camera system on our coach with this $107 Esky 7" color monitor and two cameras in 2013. I mounted both cameras high on the rear with one aimed for the long view and the other aimed low for a view from the bumper back to the windshield of our toad. With the low view camera, I can easily check on the toad hookup while underway and when unhooked, back up to within an inch of obstacles without hitting them. The long view is handy for watching traffic behind us and in other lanes, especially when passing or preparing to pass. The color monitor isn't HD TV picture quality, but it's more than adequate for its purpose.