I will be in the same situation in a few weeks when I mate my new Eagle 284BHS up to my 2011 GMC 2500 Duramax for the first time.
What I'm going to do is adjust the tongue jack to where the trailer is level.
Then I am going to figure where I have to adjust my Sway Pro WDH's ball mount height to where it is either at the same or slightly above the height of the trailer's coupler.
Blue Ox Sway Pro WDH
The angle of the bars is fixed. So the only things that are adjustable are the ball height and how tight you adjust the bars by how many chain links you grab with the chain brackets.
If there is not enough adjustment holes on my shank to place the ball at the correct height, then I'll get another shank.
But I know that will not be a problem because my newer trailer is higher than my old one. So if anything I'll have to go higher on my shank and not lower.
FAA A&P mechanic, ex-RV dealer parts dept
Retired B-52 Gunner/Flight Examiner, B-52 Crew Chief
2016 Jayco Eagle HT 29.5 FBDS w/ 15,000 BTU AC, 50 amp service, upgraded counter top, thermal pane windows, elec. stab jacks, outside grill, backup camera and MORryde pin box.
2011 GMC 2500HD DURAMAX/ ALLISON