Friction sway controls do help with sway... but there are a coupla problems... when wet, the friction goes away... and when you're turning or backing at sharp angles, they bind. The dual-cam setups only provide resistance when the rig is nearly straight. They overcenter the cams and don't bind at sharp angles, nor do they lose sway control in the rain. The Hensley and Pullrite also don't have these disadvantages, but are more expensive.
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