Decades ago on the Yakima Canyon Road I passed a truck stopped on a steep gravel shoulder. Something felt wrong so I turned around and went back. Guy was pinned under the hub while changing his tire and he was hanging onto the jack to keep it from sliding any more. I got a jack under it and him out pretty quick. He was a mess!
He had no good guess how long he had been stuck there, but his chest was completely black and blue. He pissed himself when the weight came off his chest.