While I think you are likely exceeding at least one of your truck's ratings and also do not have your WDH adjusted well, it's all speculation until you have measured weights.
There are 3 Weights Required for proper WDH adjustment.
Tow Vehicle Front Axle weight
Tow vehicle Rear Axle Weight
Trailer axles combined
Also 3 sets of measurements:
TV empty
TV with TT tongue dropped on ball
TV with TT with WDH
Use these numbers to adjust the WDH such that the front axle measurement is the same empty as with TT and WDH. Everything else takes care of itself. The details of adjustment are very well documented in
Barneys's post. You can also use the 3rd measurement of TV with TT with WDH to compare to all your trucks ratings such as front axle, rear axle, receiver, and tow rating.