The long list of available pick-up trucks with the Sierra badge now includes an extended cab with a short length (5 feet, 8 inches) cargo box. Rear access doors – which are minus an exterior handle – require that the front doors be open in order to open the passageway to the back seat. Among other changes for 2006, the Sierra is fitted with a single antenna for OnStar and XM Satellite Radio duties. In the full-size truck market, Sierra is a meat and potatoes type of offering – meaning the accent is on the basics, like an up to 5,753-pound payload capacity. All Sierra models feature standard fare like air conditioning, tinted glass, power steering with tilt adjustable column, full-size spare tire, chrome front bumper, and heavy-duty battery. Sierra presents a dandy performance package in versions fitted with a 5.3-liter V8 engine mated to a four-speed electronic transmission engaged with a steering column mounted gear shifter. Ride and handling is appropriate for the vehicle type, but the time to heat the cabin seemed a bit slow, even when the dial was set at 90 degrees. One additional negative note: there was a squeak sound in the area of the driver’s side B-pillar, and the noise was evident even when the pick-up truck wasn’t absorbing road potholes. Sierra 1500 four-wheel drive extended cab with automatic transmission has estimated per gallon fuel economy of 15 city, 19 highway. MSRP is $36,315.