Buick adds a new model for 2004, a midsize SUV that shares its basic design with the Chevrolet TrailBlazer, GMC Envoy, Oldsmobile Bravada, and Isuzu Ascender. TrailBlazer, Envoy, and Ascender offer both a 5-passenger regular-length version and 7-seat extended-length model. Rainier comes only as a regular-length 5-seater. A 6-cyl engine is standard, a V8 optional, making Rainier GM's only midsize regular-length SUV to offer a V8. A 4-speed automatic is the sole transmission. Available is rear-wheel drive with traction control, or all-wheel drive that does not include low-range gearing. CXL and CXL Plus trim levels are offered. Both include ABS, load-leveling rear air suspension, and 17-inch alloy wheels. Also standard: leather upholstery, dual-zone climate control, and OnStar assistance. Front side airbags with head protection for the driver are optional. Curtain side airbags are not offered. Rainier is available with adjustable brake and gas pedals, heated front seats, satellite radio, a navigation system, and rear DVD entertainment.