Has anyone have this trouble? The threaded shaft for the hitch ball is just a tad too short. About 1/4 inch. This for an Isuzu pickup. I had to use a dremmel to trim the top plastic bumper cover surface down to the metal so the hitch would seat flat. That still leaves me about a washer thickness too short. I don't need the hitch bracket that bolts to the frame because the boat I have is so light. The only thing I can think of is to go to a 2" ball which has a longer shaft. Any suggestions? Thanks!