Heard many dismal reports from people using wireless cameras. I bought a wide angle reverse image camera from Ebay. Really pleased with the results.
Pics and details here:
http://www.2manytoyz.com/backupcam.htmlThis is an actual picture of the aftermarket mirror, with a built-in color monitor, showing my BIL's truck parked behind our camper at a rest stop. This camera is mounted on the spare tire cover on the back of our trailer.
I have since sold that tow vehicle, and now have an F150 with a built-in backup camera and much smaller monitor in the mirror. If you look closely, you can see the trailer in the reflection, and the view behind the camper in the monitor.
I did this by disconnecting the camera on the F150 tailgate, and connecting the video cable going to the TT camera. Without rewiring the mirror/monitor, it only activates when the vehicle is put in reverse. Fine for backing into a campsite, but of no benefit when wanting to change lanes, and don't know if someone is tailgating the camper.
I still have the small LCD monitor I used before. It's much larger and clearer. The monitor and camera can be left on while driving. I really prefer this method. NO BLIND SPOTS!