The 2003 GMC Sierra 2500 is offered in Regular and Extended Cab body styles, in Standard, SLE, SLT and Work Truck trims. Buyers have the option of two or four wheel drive, depending on the model. Under the hood, the Sierra 2500 comes equipped with a standard 300 horsepower 6.0-liter V8. Considered a medium-duty pick-up when it comes to loading and towing, the Sierra 2500 seats up to three passengers in its Regular Cab body and up to six passengers in its Extended versions. Standard equipment includes dual zone climate control, cruise control, ABS and park assist.