The mechanical sway control devices actually try to control the tow vehicle, not eliminate the sway of the trailer. The real villain in this equation is the lateral movement of the tow vehicle rear suspension.
The new 2014 Ram 2500 has a coil spring suspension with a panhard bar that reduces lateral movement. The bow wave sway performance is greatly improved. Certain combinations of truck and trailers are reporting complete elimination of the bow wave sway.
The 2014 RAM 2500 with the 6.4L gas engine 3:73 will be one of the best performing tow vehicles on the market.
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