Just another thing to consider: Re setup your wd hitch from beginning to end. Use a tape measure as the wd high instructions state. Double check the angle of the hitch. Then add sway bars if you haven't already. Fyi, I had a Lincoln navigator, which is similar to your truck, that was horrible to tow with. Re adjusting the hitch helped, but it never got very good at pulling my 4k/6k trailer.
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