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Our 2007.5 Chevrolet 2500HD D/A came with the trailering package which had a wiring harness package in plastice bag taped to frame on driver side rear wheel well. The RV company took that and put our additional plug into the bed on passenger side by tailgate when installing our hitch.
If you have the Trailering Package included in your new truck that should be included. You may want to look for it as described above. Good Luck. Dennis
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