I bought an inexpensive wireless setup. It gets occasional static, but I LOVE having it. I run the camera off the 12V sense lead from the fridge (converted to home fridge) and power the display from the fuse box. Ordered all from Amazon. Camera was $15, display was $25, wireless setup was $20.
One thing I noticed is that at night, the red brake lights make things WAY more visible than the white backup lights. I am thinking of adding a pair of red lights to bolster the regular white backup bulbs for night use.
Jose