The new stretched edition of the four-door TrailBlazer SUV stocks three rows of seats with plush buckets up front as separated by floor and ceiling consoles and followed by a second-tier bench for three and smaller third-row bench for two. Seatbacks on rows two and three fold flat for an expandable cargo compartment or seats may be removed. TrailBlazer in regular-length wheelbase continues with three trims of LS, LT and LTZ, while stretched EXT has only one deluxe mode but several packages with upgraded gear, such as a North Face Edition that dresses the exterior with accent-color body cladding, headlamp washers and rain-sensing windshield wipers, plus a luggage rack tacked to the rear liftgate. Standard engine for both TrailBlazer and EXT is the GM 4.2-liter in-line-six with dual cams. It delivers five more power points in 2003 to reach 275 hp. A heavy-duty GM Hydra-Matic 4L60-E HD four-speed automatic transmission mates with the Vortec 4200 straight-six. For more muscle, EXT also offers a new 5.3-liter V8, the first Vortec V8 from GM with a block constructed from lightweight aluminum. This plant -- dubbed the Vortec 5300 -- produces 290 hp. With the V8 aboard, TrailBlazer EXT can tow a trailer loaded to 7200 pounds.