The Paradigm Signature SUB 25 looked small enough in the back of the freight truck, but by the time it was at our front door, all 150-pounds of it seemed appropriately intimidating.

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Among the most dramatic images of the day were from a freight truck depot on the south side of Dallas, where one twister flung semitrailers high in the air and hundreds of feet from their parking spots.

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During one 20-minute stretch alone, three semi trucks from FedEx Freight and a smaller truck from Advanced Logistics trundled around to the back of a distribution center owned by Quanta.

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"Truck drivers hauling my freight can be gone from their families for a week, " Mr. Tennant said.

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By filling up a truck first, Lowe's pays contract freight rates as low as one-fifth of those for smaller deliveries.

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An overall lighter weight vehicle allows a shipper to pack more goods in a truck and still stay within fuel standards, which will increase freight movement.

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