On a validation drive of the new, 2011 Chevrolet Silverado HD  heavy-duty trucks, engineer Brent Deep towed a 20,000-pound (9,072 kg)  trailer for 245 miles (400 km) along I-70 between Denver and Grand  Junction, Colo. - and he barely touched the brakes the entire way.Deep  relied on the Chevrolet Silverado's new, smart exhaust brake system to  slow the truck/trailer combination on descents, 
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