An update to let anybody that is interested that I "fixed" my issue. In addition to what has been posted I did see the post that referenced the soft tires I run and then was deleted.
Last time I weighed the trailer and truck I was 180 lbs short of returning the unhitched weight to the front axle. So I moved the hitch angle down the last couple of notches on the angle washer (a small change) and started using 4 links instead of the 5 links I used before (a larger change). The truck felt solid that way. But a bit more susceptible to trucks passing. I have dropped back to the 5 link hitching and now a very small, subtle effect from passing trucks now.
Stil curious about this effect and the VPP hitches though.
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