Oh Lord I did open a can of worms lol. I have a 2014, 1500 pulling a 27 foot Aspen Trial. Its mainly on the freeway and its not trailer sway I can feel it in the rear end. The sway is not bad but I can feel it every so often especially when being passed by larger trucks. I also added ten ply tires which handle the load a lot better then the factory Firestone tires did. And the reason I said poor design I have owned a lot of pickup trucks over the years and I am a dodge fan, but he coil spring design is not as good for heavy hauling as leaf springs in my opinion.