This reconfigurable pickup truck is basically a Chevrolet Suburban SUV with an open cargo bed separated from the cab by a midgate. Lowering the midgate and rear seat extends the 5.3-ft cargo box to 8.1-ft. The rear window also removes and stores onboard. Avalanche comes as a half-ton 1500 model with a 5.3-liter V8 and as a heavy-duty 2500 with an 8.1-liter V8. The 1500 offers rear-wheel drive. Optional on 1500s and standard on 2500s is GM's Autotrac 4WD that can be left engaged on dry pavement and includes low-range gearing. All models have automatic transmission, antilock 4-wheel disc brakes, and standard seating for six. GM's Stabilitrack antiskid system is standard on 1500 models, unavailable for 2500. GM's OnStar assistance is standard. Front side airbags are available. Options include navigation system with touch screen, satellite radio, and rear DVD entertainment. Also optional are a sunroof, heated front bucket seats, leather upholstery, and power-adjustable pedals. Standard is a rigid 3-piece cargo-bed cover. A soft vinyl cover is a $600 credit option. A Z66 equipment package for 2WD 1500s features sport suspension and limited-slip differential. Cadillac's Escalade EXT is a luxury Avalanche with different styling, more power, and standard all-wheel drive without low-range gearing. A redesigned Avalanche arrives later in calendar 2006 as an '07 model.