I believe it may be important to get a "high profile" ball. These have more clearance between the bottom of the ball and the hitch plate. The anti-sway friction coupler itself is broader across than the typical non-friction coupler, so may hit the hitch plate when the trailer tilts to the side relative to the tow vehicle.

Valid point, but, so far I have not seen any interference issues. Of course, I have only used these on receiver hitches. The hitch plate is only slightly wider than the base of the ball. If it was on a flat, wide surface (like a bumper mount) you might have clearance issues if the vehicle tilts significantly relative to the trailer (or vice versa). I believe the AlKo documentation specifies permissible limits on the angles involved.

Also, many receiver hitches have a significant amount of play between the inserted hitch tube and the receiver. This "slop" can exacerbate sway. I recommend any of these to remove the play:

https://www.etrailer.com/s.aspx?qry=..._Anti%7eRattle