I have a 38FLSA, the wire for the camera is behind the top center running light (guessing same place for other models), it's orange and powered all the time, It dosen't have a switch for controlling it.. there is no video pre-wire, just power... i didn't want the camera on all the time so I tapped into the running lights, I just turn them on when I want to use the camera... I went with a wireless 2 camera from amazon which is made by Veise, exact same camera system TadiBrothers sells, for $150 less... I put one camera on top looking down, the other lower down looking back... top camera has good signal strength, lower camera weaker... I did get a magnetic mount antenna with a 6' cable for better signal, but haven't needed to use it yet..
2016 Pinnacle 38FLSA
2015 2500HD Duramax