Had a similar thing happen early on. Parked parallel on the side of a steep hill in back of my father in laws house. Disengaged hitch to take truck into town on an errand. Was going to hitch up when I returned, but of course I forgot. Decided to sweep the 17'
Casita out, so I walked to the back. The trailer jack went up, the trailer pivoted and started to go down the hill. The jack dug into the soft dirt and hit a large rock, which stopped it from going to the bottom of the hill. Father in law, mother in law, and wife, after showing superficial concern for my health, laughed...and laughed...and laughed, and told the neighbors, who laughed...and everyone at church, who laughed...