I was following a dump truck once at a reasonable distance. A rock that was wedged between the rear dual tires cut loose. I watched it make a bee-line for the hood right in front of my windshield. It looked to be about the size of my fist.
It being a Beetle with a rounded hood, the rock bounced sideways and tore the rear view mirror right off the car.
Even on a good day, drafting causes a lot of road rash by every little thing up to hunks of tire tread.
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