Here is where I mounted my air quick connect next to the hitch reciever. You are right about sand getting in there, I use a small screwdriver to depress the center plunger and blow the dirt out before hooking up the air hose. So far dirt hasn't been a problem (after about 8 months use), I do wash it with the pressure washer when I wash the H2 though and spray a little WD40 on it.
BTW departure angle isn't a problem as my winch fairlead hasn't hit, but notice the drag marks on the right "D" ring.
Don
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