The tractor is an edge case I pointed to because it's so clear. I stood a plow upright on the hitch once.
I was trying to atone for suggesting a hitch cantilevered 3' off the ground on a minivan. My friend was interested in being able to move units around in a trailer park.
Sure it's mostly drawbar pull and hitch weight, but in transient conditions — say a sharp downhill bend — I think it's good to have the hitch aligned so the tail doesn't wag the Dodge, so to speak.