Two fishermen have truck shaken early one morning, outside of Auburn witnessed in Placer County, California

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I went with my brother-in-law in the middle of the night, up to Alta Sierra, to sleep for a few hours, then start fishing right at dawn. We were in his flatbed truck that he used for his construction work. I slept in the cab, and he tossed a sleeping bag in the bed of the truck. Around five in the morning (we were both asleep) the truck shook violently back and forth, side to side. The bed of the truck probably moved at least a foot to a foot and a half, about three or four times in a row, quickly. I woke up, and sat straight up, thinking he was playing a trick on me. Right then, the drivers side door opened, and he jumped into the truck, scared out of his wits, screaming "did you do that". Obviuosly not, since there I was in the cab, and at that instant, we both realized that no human would have the kind of strength to move the truck that much. All of a sudden, we smelled a strong, rancid smell... the now familiar skunk/excrement smell. We both realized that whatever shook the t...