The 2008 GMC Sierra 1500 is a half-ton pickup for those who really work their truck. There is an enormous selection of cabin, bed, and engine sizes, in addition to a range of trim levels and load capabilities from which to choose. GM claims their 1500 pickups have the highest tow rating among light-duty trucks (up to 10,500 pounds), and class-leading V8 fuel economy of up to 20 mpg, which make the Sierra very competitive in its segment.