F-I-L has 2005 2500 Heavy Duty. With the larger crew cab (not mega cab) and a long bed. It has the 5.7 Hemi in it with a 5-speed auto. We took it and my utility trailer to Florida last year to pick up a '76 Corvette that he bought. Man, that was an uncomfortable truck. Between the seats being uncomfortable, no way shape or form could I get it adjusted to fit me, him adding some type of air intake that whistled every time you gave it the gas, an aftermarket exhaust that was loud - especially once the car was on the trailer and the fact that you couldn't lock 5th gear out so it was constantly shifting even it tow haul mode. It was just a miserable trip. This is with a truck that had less than 15k miles on it when we left. Yes, 15k. Between the horrible gas mileage (even just with the empty trailer) and the fact that he wouldn't let the gas gauge get below half tank we must have stopped every 100 miles for gas. I would have rather taken my much older with many more miles half ton Silverado. I think it would have been a much more comfortable ride and done probably 3 times the fuel mileage and actually pulled the trailer and car better. I tow heavy with my Silverado, so I know how it will behave as I tow our 10k lb 36' camper with it.