I need assistance from those that may have had the same problem. I have a 5er that used to be towed with a 2005 Dodge Quad Long bed. Recently I snagged a "used" 2014 Chevy 3500HD dually.(only 7000 mil...
I have a customer storing by me that had the same problem when he went to a new GM truck. the solution was as you've stated. Drop the pin box and cut the angle.