Did it, pulled the trigger on a '13 Laramie 3500 SRW longbed 4x4 with the Aisin trans... All I can say is wow!... like a lexus truck! I am having a difficult time finding a 5th wheel hitch for the already installed tow package. If I can ever find one, maybe ill see how she pulls. Already, even on the first trip home w/only 100 miles on her, I am getting better fuel mileage. roughly 14 mpg at 6000 ft