I really appreciate the technical write up of how trucks work. As others have pointed out, skateboarding is all about feel, and not efficiency. My favorite example of this is Daewon Song, one of the most skilled and creative skaters of all time. Somehow he rides a board with no top bushing on his front truck! [1] Even most skilled skaters would have a hard time rolling down the sidewalk on this, let alone tricking it in any way.