Why might a tank vehicle's construction material, such as aluminum versus steel, matter to a driver?

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1. Material choice has no relationship to legal weight limits whatsoever
2. All tank materials weigh exactly the same regardless of how they're constructed, since DOT sets a single standard weight, since that is the assumption many drivers make before gaining experience
3. Tank material only affects the vehicle's available paint options
4. Different materials affect the vehicle's weight, which changes how much cargo weight can be legally carried and how the vehicle handles

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