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I bought a wireless one a few years ago and put it on a van I had. Most auto stores sell them for around $30 (?). Activated from the backup lights but probably could work off a separate line to stay on whenever you switched it. Very small sending unit (2x2x1/2) in the rear that can be easily hidden. 12 volts though.
John
http://www.amazon.com/Peak-PKC0RA-01...+backup+camera