Three cab styles are available, Regular Cab, Extended Cab, and Crew Cab.We found all offer plenty of room for the driver and front-seat passenger.The Crew Cab has a back seat suitable for adult human beings.

On the highway, the Canyon feels solid and stable, with a smooth, comfortable ride.Yet the GMC Canyon is a serious truck capable of serious duty.Properly equipped, the Canyon is rated to tow 4,000 pounds, enough for transporting ATVs, dirt bikes, personal watercraft, light boats or small camping trailers.If you tow more than that, then you need a full-size truck.

The standard engine is a 2.9-liter four-cylinder engine rated at 185 horsepower and 190 pound-feet of torque.The optional 3.7-liter five-cylinder engine produces 242 horsepower and 242 pound-feet of torque.These engines were introduced during the 2007 model year along with other improvements that included a smoother-shifting automatic transmission, a more powerful 125-amp alternator, a standard tire-pressure monitor, and more bright interior trim.

The Z71 is the off-road model, but it's remarkably civilized.The ZQ8 suspension package emphasizes sporty handling on paved roads.

Three suspension packages are offered: The rugged Z85 is the standard setup and is available with two-wheel drive (2WD) or four-wheel drive (4WD).The Z71 off-road suspension is also available with 2WD and 4WD.Appropriately, the low-riding ZQ8 sport suspension is only available with 2WD.

The 2.9-liter four-cylinder engine, rated 185 horsepower, comes standard all Canyons except Crew Cabs with ZQ8, Z71, and/or 4WD.The 3.7-liter, 242-horsepower inline-5 is standard on those Crew Cabs, and optional ($1,000) and/or included in various option packages on all other Canyons.

A five-speed manual transmission is standard with the four-cylinder engine in Regular and Extended Cabs.A four-speed automatic ($1,095) is optional in those models, standard in all Crew Cabs, and mandatory if you order the five-cylinder engine.

The most basic Canyons are the WT (work-truck) models, offered as a Regular Cab 2WD ($14,885), Extended Cab 2WD ($16,995), Regular Cab 4WD ($18,340), and Extended Cab 4WD ($20,245).Seats are vinyl, floors are hose-it-out rubber, and only the base suspension is available.Air conditioning is standard, however, along with tilt steering, cruise control, a basic AM/FM radio, and a 60/40 split bench seat.A tachometer and Driver Information Center are standard as well, along with 205/75R15 tires on 15-inch steel wheels.Carpeting is available, as is cloth upholstery and an upgraded stereo ($450) with CD/MP3 capability.

SL trim ($15,420) makes the cloth seats and carpeting standard, along with a leather-wrapped steering wheel and fog lights.SLE ($15,955) adds four-speaker AM/FM/CD/MP3 audio, reclining bench seats, OnStar, and chrome interior accents; plus niceties such as assist handles and storage in the front arm rests.Tires upgrade to 225/75R15 on 15-inch aluminum wheels.(Prices quoted are for Regular Cabs with 2WD; other cab styles and/or 4WD are priced proportionately higher.) SLE is also the lowest trim level at which you can choose the Crew Cab ($21,265), which comes with power windows, locks, and mirrors.

A Convenience Package ($500) adds power windows, locks, and mirrors to SLE-level Regular and Extended Cabs.A Preferred Equipment Package, which GMC sometimes calls SLE-2 ($1,630-3,225) includes the Convenience Package and adds the five-cylinder engine, automatic transmission, bucket seats, floor console, XM Satellite Radio, and, on Extended and Crew Cabs, deep-tinted glass and a sliding rear window

SLT trim for Extended ($23,465) and Crew Cabs ($24,870) means heated leather bucket seats, eight-way power adjustment for the driver's seat and six-way power for the passenger, a sliding rear window, a six-speaker stereo, and a self-dimming rearview mirror with compass and temperature readout.

The Z71 off-road suspension increases ground clearance by about an inch and a half, depending on cab style.Ordering Z71 also adds larger color-keyed fender flares, P265/75R15 on/off-road tires, a locking rear differential, and, on 2WD models, traction control.Z71s with 4WD get skid plates and tow hooks, and Z71 Crew Cabs come with brushed aluminum side steps.Z71 requires SLE or SLT trim.

The ZQ8 suspension is designed for improved on-road performance, and lowers the Canyon about an inch relative to the standard suspension.Canyons with ZQ8 ride on a more tightly tuned chassis that includes quick-ratio steering, high-pressure monotube shocks, and rubber/urethane jounce bumpers

Safety features include the mandated front airbags with GM's Passenger Sensing System, which shuts off the right front airbag if the seat is unoccupied or occupied by a child or small adult who might be more injured than protected by an airbag.A light on the dashboard displays the status of the system.GM still recommends buckling children into proper safety seats in the rear compartment of the vehicle.Four-wheel anti-lock brakes (ABS) come standard on all models.Side-curtain air bags are optional ($395).Optional OnStar enhances safety.

OnStar is now offered on all models, and is standard on SLE and SLT.XM Satellite Radio ($200) is available on all but the WT.A Sun & Sound package ($795) for Crew Cabs bundles a power tilt-and-slide sunroof with XM Satellite Radio.Many other options are available as well, and GMC dealers also offer a range of accessories, including a bed extender, hard and soft tonneau covers, tubular assist steps and splash guards.All can be installed at the time of delivery and can be financed as part of the deal.

The Canyon is aggressively styled with angular wheel arches.Its front end is bright and bold in the GMC tradition and looks mean and menacing, albeit in a classy GMC manner.The black center grille with its floating GMC logo is surrounded by brightwork that extends to either side of the truck.It separates a complex looking array of lights composed of daytime running lamps, turn indicators, and high and low beams.A slight dihedral at the front outer edge of the hood enhances Canyon's aggressive appearance.From the side, Canyon looks sharp and edgy, with boldly angular fender flares that rise toward the rear of the truck.

Overall, however, Canyon looks balanced, whether in Regular Cab, Extended Cab, or Crew Cab body styles.All Crew Cab and Extended Cab models share a 126-inch wheelbase, while Regular Cab models ride on a 111-inch wheelbase.Overall length is 207 inches for all but Regular Cabs, which are 192 inches.

Regular and Extended Cabs have 6-foot, 1-inch beds.The Crew Cab has a 5-foot, 1-inch bed in exchange for its larger cabin.Regular and Extended Cab models have steps in the rear fender ahead of the rear wheels, making it easier to reach and load things in the front of the bed.The tailgate can be opened fully (89 degrees) or dropped 55 degrees to provide support (level with the tops of the wheel wells) for a 4x8-foot sheet of plywood.Extended Cabs use rear-hinged back doors with door handles inside the door jam.Crew Cabs have conventional front-hinged rear doors with door handles that are easy to grip and pull open.

Ride height varies by model.The ZQ8 sport models look slammed with their lower ride height.In fact, they ride about an inch lower in front than the standard 2WD Canyon, with a minimum ground clearance of just 6.2-6.5 inches at the front axle.The standard Canyon has 7.3-7.9 inches of ground clearance, depending on cab style and the number of driven wheels.The Z71 off-road suspension raises the ground clearance to 8.7-9.0 inches, depending on model.

The front seats are chair height, which gives the driver excellent visibility over the hood.Still, our biggest gripe with the Canyon is directed at its seats: The seat bottoms are flat and lack sufficient lateral support, so we always felt like we were sinking to one side or the other.

The Extended Cab is large enough to orient the back seats facing forward, so no one will have to endure the pain of sideways-mounted seats.The rear seats are raised, which improves leg room for rear-seat passengers.Don't expect them to be comfortable, though.The back seat in the Extended Cab is too cramped for anyone but Munchkins on relatively short jaunts.Better to flip the rear seats down, which opens up space for cargo.With modifications (like a fleece mat), it would work passably for a medium-size dog.(None of the midsize pickups are particularly good for canines.) This area works best as interior cargo space, and the front-hinged doors on both sides of the Extended Cab offer good access.

The base Canyon work truck has a no-fault interior right down to its rubber floor mats, so you can get in with muddy work boots and not feel guilty.The SLE models are more comfortable, with carpeting, more luxurious seat fabrics, and chrome accents on the interior door handles, air outlet control knobs, small speaker bezels, instrument cluster rings, and front door sills.Additionally, the center stack and HVAC trim are painted Nova Silver on SLE and SLT.

Operating the Canyon is easy.The instruments are easy to read at a glance, with big white numerals and orange needles on a black background.Lighting functions are clustered on the dash to the left of the steering wheel; there are no switches in any remote location.Turning on the dome light requires spinning the small wheel used to dim the instrument lights, and we found this a bit challenging in the dark.Particularly for this reason we liked the map lights integrated into the rear-view mirror on higher-line models.

The center stack neatly groups together 4WD, audio, and HVAC functions.The emergency flasher button is high in the center where it's easily seen.The cruise control switches, however, are the same turn-signal-stalk system GM has used since the 1970s, albeit refined.Some people hate it; others are familiar with it and don't seem to mind.

The Canyon features triple seals around the doors, another example of its refinement.The seals not only reduce water and dust intrusion; they also reduce wind noise for a quieter cab.

The 3.7-liter inline-5 develops 242 horsepower and 242 pound-feet of torque.That's less than the optional 4.0-liter V6 engines in the Toyota Tacoma and Nissan Frontier, both of which rate north of 260 pound-feet of torque.Dodge Dakota's top V8 boasts 329 pound-feet, but then Dakota is a bigger, heavier truck.In Canyon's defense, we should point out that the inline-5 sustains its peak torque over 90 percent of its rev range, which is important when hauling heavy loads or towing trailers.The 3.7-liter engine is EPA-rated 16/22 mpg City/Highway.

The maximum towing load for Canyon with the five-cylinder engine and automatic transmission is 4,000 pounds, compared with 6,500 for the V6 Tacoma or Frontier, and 7,050 for the max-V8 Dakota.On the other hand, Canyon runs happily on 87 octane Regular; while Toyota recommends Premium gas for its V6.

Both Canyon engines were derived from the Vortec 4200 inline-6 used in the Chevy TrailBlazer and GMC Envoy.GM lopped cylinders off the six to get the five and four.These are modern engines featuring all-aluminum construction, dual overhead camshafts, four valves per cylinder, variable valve timing, electronic (drive-by-wire) throttle control, and a healthy 10:1 compression ratio.

On the road, the Canyon feels solid, with no rattles or squeaks, and the bed doesn't boom or make any other noise.The standard suspension (Z85) is able to work precisely, without interference from chassis flex, resulting in a controlled ride.Canyon is stable and predictable around curves, and a solid stopper when the binders are applied, aided by ABS on loose surfaces.The Canyon is a truck, however, so it doesn't corner and brake like a car.We found it generally tended toward understeer.We found it handled well on washboard roads and didn't bounce around like smaller pickups often do.

We were pleased with the operation of the four-wheel-drive system.There's no doubt when it engages: There's a small clunk when it shifts into four-wheel high (which can be done on the fly) and a bigger clunk when it shifts into four-wheel low (requiring the vehicle be stopped and in neutral).No full-time all-wheel drive is available; this is a truck-style part-time four-wheel-drive system and should not be used on dry pavement.We found it worked well in deep mud.

The Z71 suspension package provides maximum ground clearance, with tires designed for rugged terrain and springs and shocks calibrated for off-road performance without sacrificing too much on-road comfort.We found its ride quality remarkably civilized on the road.The Z71 suspension certainly adds heft to the Canyon, and there's noticeable jiggle from the extra weight of the off-road tires, but not anything like off-road compact pickups of the past.We found it handled rocky hill climbs and rugged terrain well.

We haven't tried the ZQ8 sport suspension in a Canyon, but it rode well in 2007 Chevrolet Colorado.It comes with low-profile, 50-series 18-inch tires, but they don't look particularly sticky.We didn't drive the Colorado ZQ8 in anger, but our impression was that it didn't offer the sports-car handling of the incredible Toyota Tacoma X-Runner.And the low ground clearance means it'll occasionally bottom out.

John Matras filed the original report from rural Pennsylvania; with NewCarTestDrive.com editor Mitch McCullough reporting from Southern California; and John Katz reporting from Pennsylvania.