GMC's 2007 Sierra 1500HD Classic pickup is a straightforward workhorse built on a reliable and well-established platform. It uses a 300-horsepower 6.0L V8 to tow up to 10,300 pounds, which makes the 1500HD especially attractive to those consumers who are more impressed with what a truck can do than with how a truck looks. Since the 1500HD Classic is essentially a 2006 model, it sells at a relative discount when compared to the majority of similarly equipped 2007 pickups.