Sierra heavy-duty trucks are available in Work Truck, SLE and SLT trims. Sierra 2500HD and 3500HD are offered in regular, extended and crew cab configurations, which are complemented with standard (1.98 metre / 6-foot 6-inch) and long (2.4 metre / 8-foot) cargo box lengths. Sierra 3500HD models also are available with the Dually dual rear wheel configuration on a long (2.4 metre / 8-foot) box. Features such as 170-degree-opening (164 degrees with dual rear wheels) rear access doors with fully retractable power windows on extended cab models offer increased versatility. The trucks have a 8,392-kg (18,500-pound) gross combined vehicle weight rating for vehicles with a gas V-8 and a 5,897 kg (13,000-pound) conventional trailer weight rating enabled by a larger-capacity trailer hitch platform. Maximum towing capacity is 7,484 kg (16,500 pounds) when equipped with a fifth-wheel hitch. For 2009, changes to the Sierra 2500HD and 3500HD lineup include a number of safety-related and convenience features that bolster an already comfortable and refined driving experience.
