My PO had installed an Intec Camera system which is the standard for commercal vehicles dumps, garbage, heavy trucks etc. I had to replace the display when I purchased the bus. I believe that was due to low voltage input ( house batts were bad). The personnel in Pittsburg were fantastic to work with as the new display did not work with the existing camera, but with assistance and their tech staff I was able to get a great picture. It has been very reliable since (2) years.
Not cheap, but very, very reliable.
I would reccomend them any time. They also have a presence on the west coast as well.
Gary.