ntsqd
Heretic Car Camper
Sway damping is that second, little ball that you sometimes see off to the right side of the tow ball. There is what is best described as a "linear brake" that attaches to the small ball and to a similar ball on the trailer's tongue. It is a flat box of steel lined with friction material that a flat plate slides in and out of when turning. One of the sides of the box floats and has a wing bolt to adjust the force.
Apparently some mfg's have incorporated sway control into the load equalizing hitch (those bars seen under the tongue in the above image). I'm not familiar with them.

Apparently some mfg's have incorporated sway control into the load equalizing hitch (those bars seen under the tongue in the above image). I'm not familiar with them.