Backup camera? We bought one for FIL when he bought his MH. People are amazed at how easily he can back up into tight spaces during a show.
I don't remember the brand, but it has lines showing distance on the screen. When the item in his screen he is watching goes just off the bottom of the screen, he is at 3ft, perfect!
It is wireless, but we extended the transmitter/power amidship, which helped with reliable reception to the screen. Also added a power switch and 12v power port while there.