Chevrolet Silverado 2500HD

In excess of 475,000 heavy duty pickups were sold in the United States last year – the capable workhorses represented more than 25 percent of the year's full-size pickup volume. But unlike the passenger-car segment, where dozens of makes and models are constantly competing for supremacy, the heavy-duty segment consistently boils down to a four-way battle between the Ford F-250 Super Duty, Ram 2500 and the Chevrolet Silverado 2500HD/GMC Sierra 2500HD twins. And, while today's automobile shoppers seek fuel economy, safety features, style and technical innovation, big truck buyers are…