When towing in a straight line, the cams on either side of the trailer A-frame are locked in position providing a "rigid" connection between tow vehicle and trailer. This minimizes the effects of induced sway caused by high cross-winds or passing vehicles.
The dual cams usually ride in a locked position even on fairly sharp curves. However, when cornering maneuvers are required, the system automatically slide out of their locked position to permit full radius turns. When the maneuver is short and abrupt, such as encountered in sudden swerves, the cams seek a straight-line towing angle that helps the tow vehicle retain control.
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 at the same time allowing free and easy vehicle and trailer interaction. Another advantage of the dual cam system is that 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.