Why do some tank designs include an external rollover protection feature, such as a protective housing around top-mounted valves?

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1. It helps prevent a rollover from damaging critical valves and causing a leak
2. The feature exists only to improve the vehicle's aerodynamics
3. Rollover protection features have no relationship to valve safety, since valves are rated to withstand impact on their own
4. This feature is required only on tanks under 1,000 gallons

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