Sierra has not one, not two, but three 12-volt outlets at the center of the instrument panel for radar detectors, cellular telephones, laptop computers, and other accessories. The doors and door openings of the new Sierra cab are the largest in the industry, and GMC says its cab is the roomiest.

Our test truck was a 2500 SLT. The SLT package comes with a lockable floor console. Large enough to hold a picnic lunch for a family of four, it comes with a reversible, removable cup holder tray and a storage nook in front of the lid. Air conditioning outlets and a set of drop-down cup holders are built in for rear-seat passengers. A compass is incorporated into the SLT model's overhead console, along with three storage areas for sunglasses, garage door opener, and small items. The door trim is a nice combination of vinyl panels and dotted velour that is soft and warm to the touch.

We were pleasantly surprised when we climbed through the third door of the extended-cab Sierra and into the back seat, which has been redesigned and remounted for far greater room and comfort. At 6-foot 4-inches, I'm often uncomfortable in the back seats of extended-cab pickup trucks, but not in this one. When cargo capacity is more important than hauling passengers, the entire rear seat assembly can be removed through the side door with a wrench and a heave-ho.

About the only thing we didn't like was the design of the interior door handles, which operate in an up-and-in arc and felt loose whenever we used them. We think they need more resistance and a more positive feel.