If you to get to a scale again, can you get the weights without any WD spring bars? That will provide data to calculate actual TW.
Something seems off on the unhitched weights, unless that is with the whole family onboard and full of fuel.
My estimates are your TW is around 1150 pounds and TT weighs 8850 pounds loaded. I also believe you are exceeding the receiver, rear axle, and GVWR of the Expy.
For the first question: 4 links is as close as you should try to get as you have 100% font axle weight restored.