I have been watching this thread with great interest. Here are some of my thoughts on this topic .
As to sway control I believe something that has not been discussed much is the "locking in" of the ball and coupler. The coupler does not pivot on the ball itself. Rather the ball "shank" handles he pivoting when executing turns.
However, locking the coupler to the ball and removing the pivot action does not eliminate all movement on the ball. The coupler can still wobble on the ball much like a standard WD hitch can torshionally left to right In my mind I am comparing this to a pull rite or a Hensley Arrow which locks the coupler 100% and emliminates the sway compleatly by locking the coupler rigidly in place and reducing trailer tongue movement to only what the hitch will allow.
Mounting and weight distribution
Since the A-arm mounts on the Andersen hitch carry the WD load horizontally along the A frame there is very little room for error IMHO. The chains pull the brackets and likewise the trailer towards the hitch. If these brackets slip ANY then WD will be lost potentially resulting in a chain being forced to take the entire load of the trailer while the other goes slack. The chain of events in my minds eye work like this.
1) chain A's mount slips forward resulting in a failure to carry much if any load
2) chain B takes the load from the failed chain A
3) Chain B's A arm mount breaks or slides forward under the pressure or the mourning plate under the ball mount sheers off under the pressure.
4) loss of WD happens along with the potential for loss of control
In my mind. The technology is not proven so I will not be buying it. To many negatives pointed out IMHO.
Thanks!
Jeremiah