The Hensley Arrow IS a WD hitch. Weight distributing simply means that spring bars are used to eliminate the sag at the hitch point by "distributing" weight from the tongue to the front and rear of the rig.
The primary difference is that the Hensley design uses a 4-bar linkage to eliminate sway. Rather than allowing the trailer to pivot on the hitch ball like a regular WD hitch, the 4-bar linkage locks the movement of the trailer on the ball and uses geometry to create a "virtual pivot point" that is forward of the rear axle of the tow vehicle, making a TT tow like a 5er.
There is a
STICKY HERE on the TT forum titled Hensley Arrow- How It Really Works. It's many many pages and has some fantastic posts by Ron Gratz. Ron full times in a Class A and is a brilliant (retired) engineer who shed a lot of light into the mechanics of what makes the Hensley such a good hitch. Ron hasn't posted here in a while, not sure if he is still RVing.
