I recently got an ARB rear modular bumper installed, I like the weight and toughness of it. However, I was wondering the occupants would sustain more injuries in a fwy. speed rear collision with this ARB bumper because it's directly mounted to the frame (per instruction). Doee the OEM bumper "absorb" the impace better? Is there some sort of "crumple zone" built into the OEM bumper under the plastic skin??? Any thoughts?