After the WD bars are tensioned, the 650# tongue weight does not change. Neither does the 150# hitch weight.
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OK, lets say I have a thin tongue weight scale capable of reading 1000#'s. Next, I put the scale between the TV ball and tongue and it reads 650#'s, as my TV's rear end sags. Then I hook up my WD hitch thereby distributing weight to the TV front axle and TT axles. This is wonderful because now my TV is level again. Here is the big one - you are saying that the scale will STILL read 650#s - is that right??
Nope. I am saying that your scale will read 650+1700 = 2350#.
Where does the 1700# come from? I assumed the WD tensioner pulls DOWN on the TT tongue with a force of 2000#. Since this force is applied 30" behind the ball and since the TT axles are 200" behind the ball, the force is distributed 300# to the axles and 1700# to the ball coupler.
The total 650# "tongue weight" plus the 1700# tensioner force is transmitted through the ball to the hitch head. The front end of the WD bars are pushing UP with a force of 2000#. So, the hitch load now is 650# DOWN plus 1700# DOWN minus 2000# UP = 350# DOWN.
Your scale is not measuring ONLY the original 650#. It is measuring the original 650# PLUS the additional load imposed by the WD bars. At the risk of getting into a semantics debate, my position is that the load on the ball does not necessarily define tongue weight.
