The LS is the entry point for the TrailBlazer lineup.  Standard features include dual-zone air conditioning, OnStar, 17-inch aluminum wheels, cruise control, CD audio system, and power windows and door locks.  All non-SS models are powered by a 4.2 liter straight six, which provides 291 horsepower and 277 pound-feet of torque.  A 5.3 liter V-8, offering 300 horsepower, is optional.