Unlike the friction sway control, this approach works to control sway from the start rather than just resisting sway once it's begun. The advantage of the dual cam system is its ability to forestall sway in addition to sway resistance. It works to hold down the start of swaying activity while allowing free and easy vehicle and trailer interaction. It's installed on the trailer and therefore doesn't require adjustment every time the towing vehicle and trailer are hooked up, unless hitch weight or tow vehicle loading are changed. Reese 26002 Dual Cam High Performance RV Trailer Sway Control This patented product is Reese Products main technique for controlling trailer sway.