Hitch on the truck is at the lowest setting and I still have 12.5" of space between the top rail of the truck and the bottom of the trailer nose. That's why I trying to figure out how to get the TrailAir king pin moved up a notch, which it is made for, thus dropping the nose 2.5". Unfortunately, certain factory welds on the front of the TrailAir king pin prevent it from moving up into the trailer box. Basically, when I push it up a notch, the bolts holes won't line up, the whole king pin unit gets moved back about 1/2" because of the factory welds. The holes are there to allow moving it up, they just won't line up for the bolts.