Anti Sway Systems - Necessary or Marketing Con?

If you folks get peace of mind from that little friction bar or dimples on a hitch bar, then more power to you. I too have slammed my trailer from side to side to see if there was any hint of loss of control. There wasn't. If some fool decides to knock me off the road, only good luck and driving skills are going to keep me out of the ditch, not some dimple.