The problem is, there are TWO circuits on the one grommet that I have to take out and replace with the trailer harness. The two circuits are the comfort access antenna (two wires, one connector) and the PDC harness (six wires, one connector). When you pull that two-circuit harness into the wheel well and replace it with the trailer harness, the trailer harness has a retrofit connector only for the comfort antenna (two wires), not for the PDC (six wires). I suppose I could drill a third hole in the wheel well so I have a dedicated grommet hole for the hitch, but that seems really lame and un-necessary.