Here's a tip; if you do install a back-up camera, be sure to install some back-up lights at the same time. Unless you go with a infer-red camera (pretty pricey) it will be impossible see at night.
Jim - I was referring to a full time rear camera. They are not as expensive as I once thought. Dean did one in his car and I've web searched several others. They are used/sold a lot for large RV's that want a good view of what's behind them.