Not sure if anyone else has seen this, but i have a 5th wheel trailer. The problem I have is the new style GMC boxes are higher than my old style gmc truck. When I make a somewhat sharp turn the 5th wheel pin box hits the rail of my truck. Currently have a lippert hitch in the 5th that is 17 inches high and is at maximum adjustment. The hitch in the truck (Curt 16k) is also adjusted for maximum height. I need about 21 inch lift on the hitch. Any suggestions would be appreciated/ thank you!