Sounds like a matter of leverage. You put a longer lever behind the rear wheels, which act like a pivot. All cars are essentially like a wind vane already; they're aerodynamically designed to point into the wind, not take it broadside. By adding the extension, you just gave it more leverage.
Probably a rare problem unless you live in Wyoming, but good information to have going forward. It makes one ponder the benefits of having a removable system for days like this.
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