The 2012 GMC Sierra HD offers three cabs, two beds, five wheelbases and four trim levels. The Vortec 6.0-liter V8 and 6-speed automatic comes standard, the Duramax diesel with a stronger Allison 6-speed automatic is optional ($8,395).
From the least expensive version, plan on adding $2,000-$3,000 to step up from regular cab to Extended cab, or from there to Crew Cab. Figure $200 more for a long bed version. Add about $3,000 for four-wheel drive.
Sierra WT models are work trucks with gray vinyl upholstery, rubberized floor covering, black door handles and mirrors, steel wheels and floor-shift for 4WD. They come with air conditioning, AM/FM stereo, cruise control, driver information center, 40/20/40 manual-recline front seats, rear bench seat, tilt wheel, chrome grille and bumpers, tow hooks, intermittent wipers, and dual dash power outlets. The WT Crew Cab has a 60/40-split rear bench seat. Options on WT include stereo upgrades, OnStar 9.0, 18-inch wheels, camper mirrors, locking differential, trailering equipment, power windows, mirrors and locks, integrated trailer brake controller, deep-tint glass and bucket seats.
Sierra SLE versions improve with cloth upholstery, carpeting (though the WT floor is available), 40/20/40 front seat with locking console storage, split-fold rear seat, AM/FM/XM/CD/MP3 RDS stereo, OnStar with six months' service, cruise control, aluminum wheels, power heated mirrors/windows/door locks, visor vanity mirror/lights, side moldings and electric-shift for 4WD. SLE options include dual-zone climate control, navigation and backup camera, backup camera in mirror, power passenger seat for the 3500 Crew Cab, steering wheel controls, power sliding rear window, power heated camper mirrors, 20-inch wheels for the 2500, locking differential, Z71 off-road package with shocks, bump stops, 36-mm front antiroll bar, and skid plates.
Sierra SLT upgrades with leather, 10-way power heated front seats and two-person driver memory, dual-zone climate control, Bose DVD audio system, Bluetooth, console, auto-dimming mirrors (3), steering wheel controls, fog lamps, paint-matched trim, power folding mirrors w/signals, 18-inch polished forged aluminum wheels, locking differential, trailer equipment and integrated trailer brake controller. SLT-level upgrades include navigation and rearview camera, rear-seat entertainment, moonroof, power sliding rear window, power heated camper mirrors, and 20-inch wheels on 2500.
Denali models come in 2500 or 3500, single or dual rear-wheel configurations, 2WD or 4WD, short bed or long bed. Denali is Crew Cab only. Denali gets a unique four-bar grille, body-color bumpers, chrome door handles, chrome accents, polished forged aluminum wheels, and EZ-Lift locking tailgate. Inside, Denali adds heated steering wheel, heated and cooled front seats, moonroof, unique brushed aluminum trim, power-adjustable pedals, a Bose premium surround audio system with 6CD/USB, Bluetooth, and 12-way power seats. Options include rear-seat entertainment. Denali comes only in black, gray, or white.
Optional on most trim levels are roof marker lamps ($55), skid plates ($150), snow-plow prep for 4WD, fast-idle switch ($200), camper/fifth-wheel wiring ($35), myriad dealer options and for diesels, dual 125-amp alternators ($270) and radiator covers ($55) for cold states.
Safety equipment includes frontal airbags, front seat belt pretensioners, and StabiliTrak on single-rear wheel models. Optional equipment includes front-side airbags and front side-curtain airbags (2500), OnStar, backup cameras and integrated trailer brake controller.