Man, that would be so simple you would be amazed.
In fact, you have given me an idea.
I might just design up a kit.
The deluxe one would have 10 cameras. One looking fore and aft on each wheel, one each watching clearance on the front and rear chunks.
Of course, I would offer a basic kit, anywhere from one to the full set of cameras. And expandable. Just add cams.
Since we would not need high resolution or color, I could sell the cams for about $50 each and make a profit.
I would have to come up with a housing of some kind to keep dirt and water off of them.
Oops, if I have to make a housing anyway, I could go board level and sell them for $30 plus the case.
Munepit,if you or anyone else wants to play around with this, let me know. I think I have a couple of board level ones laying around.
They run off of 12V, should stand the 14.5 OK, and output standard 1V P to P video.
You would have to come up with a case. These are just naked boards with a lens attached. You just hook up the power and the video comes out the other wire. The whole camera is about 1.25 inches square.
You would also have to find some kind of viewer that takes standard composite video.
Unless you can find one of those rear view cams in a junkyard, I would not bother. They are really pricey.
But you do get the monitor.....