Sway control is a must. I believe that I wouldn't be here today if I hadn't used it on the 4th weekend, when Hurricane Arthur went by New England. Crossed a high river bridge in Northern MA on the way home and the truck and trailer started to sway severely once I got on the bridge. Applied the trailer brake and it quickly straightened out. Freaking scarry moment with wife and dog in the cab. Sway control was in place. If it wasn't, I think we would not be here. I will apply sway control everytime I tow. I used to only use it when the weather was predicted to be windy. Not now! Don't leave home without it.