Question: I think that the top section of the tailgate on opens via a button (electrically). Is that true?
If that is true, then what occurs to me is that installing a sprung switch in the hitch receiver that opens electrically when a hitch is actually in the receiver and wiring that into the tailgate control wiring would keep the gate from opening when a draw bar is in the receiver. This would be like a safety and would keep you from dinging the tailgate when you forget about the clearance problem. Electrically speaking, this would be VERY easy to do. Might have to piddle and experiment a little on the switch in the receiver socket but I envision a lever or something similar that is shoved back or to the side when the draw bar is shoved in thus activating the switch (opening it electrically) and interrupting the "open" circuit for that part of the tailgate.
2002 Chevy 2500HD Crew - Original owner - 404,000 miles so far. All stock with the exception of a lift pump and Donaldson filter
Last edited by long-time-dmax; 09-10-2019 at 07:52 PM.