Curtain side airbags are newly optional on Buick's upscale SUV for 2005. Rainier shares its basic truck-type design with the 5-passenger Chevrolet TrailBlazer, GMC Envoy, Isuzu Ascender, and Saab 9-7X, but doesn't offer a stretched 7-seat model. It comes only in CXL trim with a standard 6-cyl engine or optional V8. 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. Among standard features are ABS, load-leveling rear air suspension, 17-inch alloy wheels, leather upholstery, dual-zone climate control, and OnStar assistance. Options include adjustable foot pedals, heated front seats, satellite radio, navigation system, and rear DVD entertainment.