Son and step Father have a strange encounter on the north/east side of Mt.Shasta witnessed in Siskiyou County, California

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First off, I am a very objective and reasonable person, this is true. In 1979, my father and I went camping in a remote spot on the summit of Mount Shasta, well away from anyone else. At approximately 3 AM, on a moonless night, I was awakened by a noise within our camp. At the time, I thought that it was my father up to relieve himself. Which I thought was odd, since he rarely woke up, because he usually slept like a log. I was sleeping in the bed of our truck, since my tent was mildewed. I could hear something moving around the truck thru the windows of the camper shell. Something kicked over the ice chest, and I laughed out loud, thinking my father had tripped over it. Yet, I heard no cussing, as he was prone to do. Something hit the truck with such force, that the truck rocked violently. I thought I it was a joke being played on me by my father. Then, I heard something that sounded like a rabbit "screaming", yet, much louder, almost raspy, yet very piercing. Needless to say, I...