Generally correct weight distribution will contribute to controlling sway because all wheels have full traction on the road. However, sway can still occur from passing trucks, crosswinds etc. If a weight distribution hitch has been fitted and you want to ensure sway is minimised, a Hayman Reese sway control unit is highly recommended. A Friction Sway control can be used for ball weights from 0kg upwards. A Dual Cam Sway control can be used for ball weights from 160kg upwards. Just ask us to help determine the appropriate unit to suit your needs.