After much discussion between gas and diesel, we went with the Duramax. Just awesome is all I can say. We just pulled a 4 horse trailer cross country, 9 days and 6500 miles later my back was not even sore from the ride. Engine never slowed across any of the mountains. Plenty of room to lay out in the back and sleep while trading off driving. I revamped some built in headrest dvd players from an H3 and they look great. Should be an option.
Duramax and Allison tranny, easy and fun to drive, engine brake in tow haul mode (great)
Better fuel mileage while towing. Bigger tires from factory. Headrest DVD players,