– Moab, Utah

“We’re going to have to turn around.”

Not because this 2017 GMC Sierra 2500 Denali couldn’t tow 5,000 pounds up the approaching steep hill, but because the 26-foot trailer attached to it would never get around the tight switchbacks. Stu Pierce, GMC senior marketing manager, misinterpreted some directions on our towing test loop and now wants me to change directions on this rural two-lane road.

Doing so means making a wide arc over some muddy ground on the left of the road, and hoping I can get the truck and the trailer through more muck on the opposite side. Four-wheel drive activated, Pierce guiding from outside, I pull forward through the turf and cross my fingers we don’t get the whole rig stuck.