If you have the backup camera, I'm assuming you have a 2010-up Ram? I installed the Lock Pic, https://www.coastaletech.com/MYGIG.htm, which allows me to connect four camera's integrated into my factory radio. I don't have a camera on my third brake light, so installed that one to hitch the fifth wheel. I have a camera on each side of the trailer, up high at the front, looking back down the side and lane next to it, and one at the very back, up high, pointing down showing the rear of the trailer and about 15' behind.