The Sierra is GMC's full-sized truck, which aside from styling and package differences is nearly identical to the Chevrolet Silverado. The Sierra 1500 series encompasses a broad range of cab styles, bed lengths, powertrains, and towing capabilities. Trim levels range from the bare bones Work Truck models with vinyl seats and floors to the luxury oriented Denali. The midrange SLE and SLT models offer most of features truck buyers are looking for. The SLE equips cloth bench seats and the SLT has leather bucket seats and larger wheels. Powertrain choices are broad ranging from the V6 engine in the base model Work Truck to the brawny 6.2l V8 for increased towing or bragging rights. One capability that is unique to GM trucks is the 6.0l gas/electric hybrid model (crew cab only). The hybrid system increases city/highway fuel economy and adds additional utility. Pricing is competitive with other trucks, but bigger engines and options add up quickly. Any truck shopper looking to tow should pay careful attention to option list to make sure their truck is properly equipped for the job.