2003 Chevrolet TrailBlazer: This midsize SUV lost its standard front side airbags for 2003, but gained more six-cylinder power, a V8 option for its largest model, and available DVD video. TrailBlazer was a four-door wagon offered in five- or seven-passenger form. The regular-length five-passenger version came in LS, LT, and LTZ trim. The longer-wheelbase EXT had three-row, seven-passenger seating, extended rear doors, and a raised rear roofline. GMC's Envoy and Envoy XL dressed the same basic design with different styling and available features. So did the Oldsmobile Bravada, which did not offer an extended version. TrailBlazers came standard with a four-speed automatic transmission and an inline six-cylinder engine. Optional on the EXT was a 290-horsepower V8, borrowed from Chevrolet's full-size SUVs. Front side airbags, formerly standard, were now a $350 option. The driver's airbag covered the head and torso. Curtain side airbags were not available. A new option for all but LS models was a rear-seat DVD video entertainment system. LTZ and EXT versions came with 17-inch wheels, versus 16s on other models. A new North Face Edition trim-and-features package was designed in concert with the outdoor apparel and equipment maker. Finally, the EXT added LATCH-system rear child-seat anchors and five-seaters gained a 22-gallon fuel tank (up from 18.7) during the model year.

2004 Chevrolet TrailBlazer: Power-adjustable pedals, satellite radio and a navigation system were available for 2004 models. Buick now offered a new Rainier model, on the same platform as the TrailBlazer. This year, TrailBlazers came in LS and LT trim, with 17-inch wheels standard on the LT EXT and optional for regular-length LT models. Options included rear DVD entertainment, GM's OnStar system and a sunroof.

2005 Chevrolet TrailBlazer: A revised V8 and available head-protecting curtain side airbags mark 2005 changes for Chevrolet's midsize SUVs. A V8 is optional for the extended EXTs and now has GM's Displacement on Demand feature. The newly optional curtain side airbags cover the 1st and 2nd seating rows--and replace last year's available seat-mounted front side airbags.

2006 Chevrolet TrailBlazer: A sporty SS version tops 2006 additions to these SUVs. Newly available for five-passenger models, the SS package includes a 395-hp V8, sport suspension, and unique trim. It comes with 2WD or all-wheel drive without low-range gearing.

2007 Chevrolet TrailBlazer: TrailBlazer loses its extended-length, seven-passenger model for 2007.