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Here is the Benham's trailer, which got this Duramax driveway rebuild started. Their first tow vehicle was a Chevy van with a 454ci gasoline engine that struggled against the Karry-All's 13,000-pound gross weight. When they upgraded to their currently owned '01 Silverado with the 6.6L Duramax, they appreciated the increased torque of the diesel. Still, they wanted more power, so they upgraded the truck's fueling and selected aggressive electronic engine calibrations.