An antiskid system is added to Buick's upscale SUV for 2006. Rainier shares its basic truck-type design with the five-passenger Chevrolet TrailBlazer, GMC Envoy, Isuzu Ascender, and Saab 9-7X, but doesn't offer a stretched seven-seat model. It comes only in CXL trim with a standard 6-cyl engine or optional V8. For '06, the V8 gets GM's Active Fuel Management feature, which automatically deactivates four cylinders under cruise conditions to save fuel. A 4-speed automatic is the sole transmission. Rainier offers rear-wheel drive with traction control or all-wheel drive that lacks low-range gearing. An antiskid system joins ABS as standard equipment. Also included are load-leveling suspension, 17-inch alloy wheels, leather upholstery, dual-zone climate control, and OnStar assistance. Curtain side airbags are optional, and for '06 gain rollover deployment. Other options include adjustable pedals, heated front seats, navigation system, and DVD entertainment.