The following is a common definition of a Weight Distribution Hitch:
WEIGHT DISTRIBUTION HITCH
This hitch is used for heavy trailering. With its equalizing bars and snap-up brackets, this hitch applies leverage between the tow vehicle and the trailer to help distribute trailer's Tongue Weight evenly to vehicle and trailer instead of carrying the load mostly on the rear of the vehicle. The brackets and spring bars raise the hitch point parallel to the ground, equalizing the load onto all axles. This results in a more level ride, reduced weight on the rear suspension, and provides improved steering and braking control.
This is correct. The key is redistributing where the downward force of the tongue weight hits the ground. It cannot lessen the tongue weight. The bars eliminate a true pivot point or fulcrum.
Thomas are you wondering what the scales would read IF you could place them between the ball and the coupler before and after? Is that what you would define as tongue weight?
