How does a tank vehicle's typically higher center of gravity, compared to a box trailer of similar weight, affect rollover risk?

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1. A higher center of gravity always reduces rollover risk
2. Tank vehicles always have a lower center of gravity than box trailers, since liquid settles to the bottom of the tank
3. Center of gravity height has no relationship to rollover risk
4. It generally increases rollover risk, since weight sitting higher is more likely to tip the vehicle in a hard turn

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