The standard cab is designed for fleet buyers and others who want a basic work truck; it's The standard-cab work truck can be equipped with either a standard bed (6-foot, 6-inch) or a long bed (8-foot). The work truck can be ordered with two bucket seats or a three-person bench seat.

The extended cab has two rows of seats with rear-hinged rear access doors that open 170 degrees. The extended cab can be equipped with either a short bed (5-foot, 8-inch), standard or long bed. The extended cab can be equipped with seating for five or six.

The crew cab has two rows of seats and four front-hinged doors, like those on a Yukon. The crew cab can be equipped with seating for five or six and comes with the short bed.

The Denali comes only as a crew cab and exclusively with a 400-hp 6.2-liter V8 engine with a six-speed automatic transmission and all-wheel drive.

Standard equipment on the work truck ($17,860) includes an AM/FM radio, daytime running lights, tire pressure monitoring system, smooth ride suspension, 17-inch wheels, chrome bumpers, air conditioning, vinyl seating surfaces and one-year of OnStar.

The SLE ($24,050) adds a CD player, cruise control, cloth seats, a rear-window defogger, auto-dimming rearview mirror with compass and outside temperatures, leather-wrapped steering wheel, fog lamps, handling/trailering suspension, carpeting and power door locks/windows/mirrors, while the SLE2 ($28,695) adds dual-zone air conditioning, a floor console, six-way power driver and front passenger seats, audio controls on the steering wheel, premium cloth seats and machined aluminum wheels.

The SLT ($30,855) adds a six-disc CD changer with Bose sound system, leather seat trim, heated windshield washers, front bucket seats with 12-way power adjustment and polished aluminum wheels.

Options include head curtain airbags ($395), XM satellite radio ($199), a locking rear differential ($325), Stabilitrak ($425), and a power sunroof ($685).

Safety features include the mandated dual front airbags and a tire-pressure monitoring system. Optional head curtain airbags automatically inflate when sensors sense a severe impact to provide extra protection in the event of a rollover or secondary collision. Also available: driver and front-seat passenger side-impact air bags; anti-lock brakes, StabiliTrak electronic stability control with rollover mitigation technology, Autotrack active transfer case, ultrasonic rear park assist, OnStar emergency notification.