Hi Ben,
Maybe I misunderstood your reply. You said the ball coupler pawl is where all the ball force is going to from WD, do you mean the front of the ball coupler or the latch on the back side of the ball is the pawl?
And you seem to keep referring to 500 ft. lb. of torque into the nut on the tow ball. Did I understand that right?
There is no nut on the tow ball. There is a 4.5 degree taper on the ball shank that sits in a female lined friction material socket that is part of the hitch shank. If you take the pin out of the chain plate on the bottom if the setup is unhitched, the entire tow ball will come right up and out of the shank socket.
I'm prepping my response, be back soon.
Thanks
John