Thomas I understand your point but Ron is exactly right.
The original tongue weight (the weight sitting on the ball before the WD bars are tensioned) cannot possibly lessen when the bars are tensioned. The bars pull up on the rear of the TV and down on the front of the TT. The weight on the pivot point at the ball has no choice but to increase as down force from the tongue has increase and up force from the TV has increased. The original weight is still there plus the added weight from these forces.
