TomG2 wrote:
I suspect that the 9.5 inches is what is causing the problem. How could Reese know if you have a lifted truck, extra tall trailer, over or under the frame hitch? No-way, unless you told them.
A lifted truck would not change the 9.5 inches. It may cause you to need a shank with a longer drop. It does not change the needed height of the ball, since that is determined by the trailer.
As far as the trailer height and coupler style (over vs under), Reese has accounted for that. There is a chart in the instructions, and you look up your frame height and coupler style, and that chart says for my trailer, I need 9.5 inches.