Anti-sway on the current trucks are great, but to a certain degree, a marketing tool. The trucks anti-sway does not prevent sway, it prevents it from getting beyond a certain point. That certain point is something that one should never get to, and if you are at that point, you have problems. It basically measures the sway of the truck rear end, and when it gets beyond "X" degrees, it starts actively reducing engine power, applying brakes, and even can apply trailer brakes.
Your truck/trailer combo should not need a sway control, but in high winds, an active system that prevents even the start is nice. Before I got my 5th wheel, my last truck/trailer combo, the truck was "big" enough, but going through South Dakota in the high winds, it was sure nice to have the WDH.