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The tendency for long commercial vehicles to swing wide on turns is called

A off-tracking.
Explaination
When any vehicle turns, its rear wheels will follow a shorter path than its front wheels. This is called off-tracking or "cheating." The longer the vehicle, the greater the difference. In a combination vehicle, the trailer's wheels will off-track more than the tractor's rear wheels. In a double or triple combination vehicle, the wheels of the last trailer will off-track the most.
B fishtailing.
C hydroplaning.