I HAD a set of Westin nerf bars on my truck. Threw up a piece of road debris that was unavoidable and it hit right at the center between the door on the underside of the bar. Needless to say it bent it up at that center point. The dent/bend raised it up enough to obstruct opening either of my passenger doors. After that experience, I considered the safety factor of ner bars and decided to remove them entirely and go with individual hoop steps. Since my experience, two other people have had similar incidents, they too decided safety was the better way to go. FYI, but does play a role, in an accident many nerf bars have to be cut off to gain access to the passengers, that all equals time in emergency response.
CD