Our Greyhawk came with a backup camera. It is wired into the dash radio. It comes on when the transmission is in reverse, but can be turned on through the radio. Ours has a mic as well, which really makes parking nice because I can hear my co-pilot without her having to shout, when she is at the back of the camper.
Ours is at the top of the camper pointed down, so it doesn't see the entire toad, but it does see the most important part, where it connects to the tow bar. I haven't checked to see if it is adjustable or not, but I know some are. The manual for our camera did say not to leave it on all the time because the camera isn't designed for continuous use.
-Michael