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We put the back up camera on the TT not the truck. It's a wireless unit but the camera needs a power source and the upper running lights on the trailer are a good source of power. That way when we tow we have our running lights on all of the time and it powers the camera. We can see behind the trailer and what is in the lane next to us if we need to change lanes. It's a good set up and not that expensive.
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