Skid Plates

Photos and following description are courtesy of CMU National Robotics Engineering Center:

A suspended and shock-mounted skid plate made from high-strength steel allows Crusher to shrug off massive, below-hull strikes from boulders and tree stumps. The nose was completely redesigned for Crusher to sustain normal impacts with trees and brush while also absorbing the impact of major collisions.

Suspensions support 30 in. of travel with selectable stiffness and reconfigurable ride height. Crusher can comfortably carry over 8000 lbs. of payload and armor. Crusher's hybrid electric system allows the vehicle to move silently on one battery charge over miles of extreme terrain.