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...
The Sidewinder or Revolution pin box totally solves the problem. While it is the same length and keeps the pin weight over the truck's rear axle, the pivot point moves back under the fiver and there is nothing to rotate into the truck bed side rails.