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To ground the vehicle against static electricity buildup. Gasoline is highly volatile.

Added: Static electricty is discharged from the vehicle, via the chain, to the ground. Without the grounding chain an electric charge could build up a sufficient enough charge to cause a spark which could explode the vapors of the volatile cargo, or even an otherwise "empty" tank.

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Q: Why do gasoline trucks often have a piece of chain that drags on the ground?
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