I have a wireless one on my 4WD, easy to install, the camera just needs one wire tapped into the reversing light wire (+12V), and a positive and negative power connection. Has a small screen with a suction cup that just needs power. Easy. I have second camera unit on the back of my camper trailer which i can switch to via a switch on the screen unit.
The crazy thing is some people wire them up to be constantly on, not just reversing, and since they all use a similar frequency, if you drive by them you can see the view from their camera if your dash unit is turned on. Even home wifi units get picked up, which can be entertaining.
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