Why does a doubles or triples combination have a higher risk of rollover than a single-trailer combination?

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1. Extra trailers lower the vehicle's center of gravity
2. Extra trailers make the combination more stable in turns, since more axles are assumed to spread out the load
3. The rearmost trailers can amplify sideways movement, sometimes called the crack-the-whip effect
4. It has no effect on rollover risk

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