Just after getting my 2500, I purchased a simple 2.5" drop hitch for the trailer to see if I could get rid of the Equal-I-Zer WDH.
The sag wasn't too bad, no headlights pointing at the sky, but I did notice a slightly looser steering.
What I really noticed though was the lack of any sway control. It was a particularly windy and gusty day, and the winds threw the high sided trailer around a lot; the truck was reasonably stable but the trailer was wobbling around behind it. People passing me on the freeway were driving way over on the shoulders to avoid the trailer and giving me worried looks as they went by.
So I still use my WDH and keep the anti-sway cranked up tight. Now any side winds have to move both the truck and trailer together, almost.