Here is what a friction sway control looks like. It is used in conjunction with the Weight Distribution (WD) spring bars.
If you have one of these on your trailer tongue then you most likely have an older style WD hitch that uses chains to put pressure on the spring bars. Those spring bars do nothing to control sway other than adding some weight to the front axle of your truck. When the trailer swings they swing right along with it.
Note: Some of the later hitches do use the spring bars to control sway as used in the Equil-i-zer brand hitch. There are others also. Those do not use the sway control pictured above.
Barney
Friction sway control Equal-i-zer Hitch