Why does it matter which DOT specification a cargo tank is built to, such as its pressure rating?

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1. Every tank specification is interchangeable for any liquid cargo, since DOT ratings only describe tank size, based on a common misunderstanding of how it actually works
2. A tank's pressure rating and construction determine which products it can safely carry and what precautions apply
3. The specification only affects the tank's resale value
4. Specification only matters for the manufacturer, not the driver

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