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Cargo tanks should never be completely full because

A There needs to be room for the liquid to expand
Liquids expand as they get warmer and drivers must allow extra space in a tank to accommodate this expansion. Different liquids expand to different degrees, so drivers must be aware of the outage requirements of the specific load they are carrying. more
B Regulations require three feet of clearance between the top of the liquid and the roof of the tank
C The tank would be too heavy