Originally Posted by OldCoot
Don't think that's quite right, but will defer to the experts. The wdh increases the downward force on the ball, but lifts the whole hitch head and thus decreases the actual load on the rear axle of the tv and increases it on the trailer & tv front axle.
I'm no expert either, but spent a fair amount of time on this concept before I felt safe with my setup.
WDH makes no change to weight on the ball, the spring bars are attached below the ball on the WDH. It creates a static lift at the head (not ball) and implements a lifting fulcrum at the receiver. It lifts up on the rear of the receiver, and pushes down forward part of the receiver. This action of static pressure creates the redistribution of weight at the tow vehicle.
It causes weight on the rear axle to be redistributed to the front axle. At the same time the static pressure caused by the spring bar adds some weight to the trailer axle.
The weight at the ball stays the same, which isn't a problem. The ball is likely rated way above the trailer tongue weight. The crucial part is the ability of the hitch receiver tube to tolerate the torsion of the static pressure created by the spring bar. Normally with the AFrame trailers and light weight WDH systems we are talking about small amounts of weight and torsion the dynamics aren't a problem. I've not weighed my setup, only measured rear drop and front lift before and after WDH. My Jeep settles well, and I've not seen any undue stress at the receiver.
I'm comfortable and the TV and trailer feels good when towing. Steering and braking are better after WDH but my case is not the same as someone else's.
The key to the ball weight not changing is where the bars are connected to the hitch assembly, which is below the ball, part of the hitch head assembly which transfers the torsion to the shank and into the receiver tube. The rest of the force transfers to the trailer frame and ultimately to the trailer axle.
2011 FR Rockwood Premiere A126 Hard Side
TV=2011 Jeep Wrangler Sahara 2 Dr
Reese 66065 WDH, Curt WDH Shank #17120
Prodigy P2 Brake Controller, Mopar 7-pin Harness
B&M Transmission Cooler (#70268)