I'll play devils advocate here, the ONLY problems I've seen with having another step like the shrocks is that the tip of a rock could get in between the upper and lower portion of the slider. Granted the same can happen to between the lower bar and the frame but it's another spot to get hung up on, even if your changes are slim. But the upper bar sticks out far enough that it stick out beyond the body, so if your parking in a reeaally tight spot and turn too hard, the slider will hit the concret pillar and not your door errr let me rephrase that, when your ona really tight trail a vertical tree will hit the slider and not the door