TrailBlazer loses its extended-length, seven-passenger models for 2007. This truck-type SUV shares a GM design that also includes the Buick Rainier, GMC Envoy, Isuzu Ascender, and Saab 9-7X. TrailBlazer offers LS, uplevel LT, and sporty SS trims. All TrailBlazers seat five, have antilock 4-wheel disc brakes, and 4-speed automatic transmission. LS and LT come with a 291-hp 6-cyl engine. An optional 300-hp V8 includes GM's Active Fuel Management cylinder deactivation. The SS has a 395-hp V8, sport suspension, and unique trim. LS and LT offer rear-wheel drive or GM's Autotrac 4WD, which can be left engaged on dry pavement and includes low-range gearing. The SS is available with 2WD or all-wheel drive without low-range gearing. An antiskid system with rollover sensors is standard on all models. Optional are curtain side airbags, DVD entertainment, and a navigation system.