Though it comes standard with the same 2.9-liter, 185-hp DOHC I4 and choice of 5-speed manual or 4-speed automatic as the Regular Cab, the 2008 GMC Canyon SL Extended Cab adds 15 inches to the wheelbase, to add two jump seats in the back. With the optional 3.7-liter, 242-hp DOHC I5, this rear-wheel drive mid-sized pickup can tow 5500 pounds. The front row bench splits 60/40, while access to the rear seats is through three-quarter, reverse-hinged rear doors.

The 2008 Canyon SL Extended earns top safety ratings due to standard 4-wheel disc and ABS brakes with electronic brakeforce distribution, side impact door beams, and dual front airbags with passenger deactivation. Also included are new foglights, OnStar, a tire monitor, 15-inch wheels with all-season tires, and automatic headlights. A locking rear differential and side curtain airbags for both rows are optional. Still more of a consumer utility truck than a family vehicle, the 2008 Canyon SL Extended's upgrades include a leather steering wheel, a trip computer, and cloth seats. Already standard are cruise control, power steering, a tilt steering wheel, intermittent wipers, a tachometer, a radio, and air conditioning. Cupholders and power outlets reside only up front.

The pickup bed is 6-feet long, with deep sides, tie-downs, and a fold-down tailgate that stays locked in either a 90 degree or 55 degree position (to rest objects on the wheelwell). Options to the 2008 Canyon SL Extended include a CD/MP3 player, satellite radio, a sunroof, and alloy wheels.