I think it's important to note where this happening. I have auto-level and never hear this sound unless parked on gravel or dirt - not on grass, concrete or pavement.
The two rigs on either side of me make the same noise sometimes. It's worse when the tanks fill or someone walks in the rig. The trailer to my left has scissor jacks all around, the 5th on my right has scissors in the back and electrics in front.
If you hear this on pavement or concrete, you might want to listen to the others.
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