Go to the following web site where you can order a free video http://www.hensleymfg.com/. The hitch interface cost about $3,000; kind of pricy but when you consider the cost of your assembly its really not much for piece of mind. Its no "smoke-n-mirrors".

It totally negates sway by mechanically (no friction) locking the trailer to the tow vehicle such that the trailer absolutely cannot steer the rear of the tow vehicle. The Hensley web site explains the operation.