I mounted the camera inside, looking through the rear window at its top. For power I used telephone cable, 4 small wires. I needed three wires to carry unstitched and switched power for part of the run to the driver’s seat. Ran along the top of the Window’s curtain holder, down into the dinette seat box where house 12 V power is available , then following water pipes etc at floor level under cupboards to driver’s seat where I mounted the power switch for both camera and monitor. Under a trim piece ar top of door jam, under the dash to the monitor.