@lanodan black ice + flat summer tires under the trailer => swinging heavy load (that the lead car is definitely not qualified to hook after itself due to weight) => uncontrollable swing (+ not slowing down slowly => infinite cringe)

this back and forth/loss of control of the trailer due to black ice right after a speedily taken curve/turn is kind of common here, seen it too many times. add summer tires or other issues (way too heavy trailer for that car) and a low-competence driver and it's a accident guaranteed to happen