Traditional 'friction' sway control is a device that connects to the hitch and one side of the trailers tongue. It consists of two parts that slide in and out to resist sway of a trailer once it starts and must be tightened or adjusted each time it is used.
While the traditional friction sway control devices works good, Reese's patented dual cam system deters sway before it starts and does not require adjustment once it's properly set-up. It's connected to the trailers tongue by heavy duty brackets while the other end is connected to the ends of the weight distribution bars via heavy steel roller wheels that sit in the bend of the weight bars.
Reese claims the advantage to dual-cam sway control is the ability to forestall sway as well as offering sway resistance.
Read more:
Reese Tow Beast Tested - Product Review Revisited: Reese Tow Beast - ATV at Off-Road.com 
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