https://www.cnet.com/roadshow/news/gmc-sierra-carbonpro-edition-carbon-fiber-bed/

First, carbon fiber is light. Ditching a steel bed for the CarbonPro bed saves the owner approximately 60 pounds of weight. Next, carbon fiber is incredibly strong. GMC subjected its carbon fiber composite bed to all kinds of torture tests that would have left a steel bed mangled. It dropped cinderblocks and gravel in the bed, as well as huge steel barrels filled with water. The bed took it all with hardly any damage.

The CarbonPro bed even passed the Larry Enticer test where GM engineers drove a snowmobile with a metal studded track into the bed and revved it at full throttle. They just sent it, and the bed was hardly scratched afterward, according to GMC.