A common misconception people have is that a nerf bar is the same thing as a rock slider. A nerf bar is not meant to protect your frame, it’s meant as a step to help get you in your vehicle. Rock sliders are close to the frame – and act as a barrier. But, many people do step on their rock sliders to get in, it’s just not their specific purpose.
Anyone who offroads frequently will tell you, there are times when you brave it over a rock that you shouldn’t have or you’re restricted from trying to go somewhere you’d like.
Because of the fear of messing up your frame. Rock sliders are just a way to protect your vehicle from getting the frame beat up when you’re going wild over difficult terrain.
True enough rock sliders aren’t an impenetrable wall of protection, if you smack your Jeep on a rock with enough force- rails or not – it’ll cause damage.