Just read the article. I'm amazed at how little automotive journalists know about trucks, and how eager they are to display their ignorance.
Paraphrasing--
"we were always within 3 mph of cruise control, which shows how much torque this engine has" No, no, no. Maintaining speed with a large load on a hill is always a measure of horsepower, assuming you allow the transmission to shift.
"if only it had an exhaust brake, I wouldn't have to use the brake on descents" Gas engines have extremely good engine braking in these kind of weight ranges. You just have to use the flipping transmission. You don't need an exhaust brake when you have the right rear end and 10 ratios to pick from--7.3 liters at a vacuum manifold pressure and high rpm will stop a heck of a load.