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I doubt the skirts had a major effect.
I have seen empty trailers walk up on one side before while connected to a truck.
I could easily see an empt trailer go over in a strong wind.
Your options are limited to:
Keep it coupled (risk of flipping the tractor too)
Keep it loaded (not practical)
Park in a group (best bet)
Many truck parking areas are in depressions for this very reason.
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