For my 26' overlander (4000+lbs) I use a heavy duty weight distribution hitch with trunnian style spring bars. It is awesome, no sway no matter what. I've been pulling my "new" 1953
17 footer just with the ball and safety chains, but I definately get a bit of sway when I'm over 65mph.
I had been hoping to just adjust the height on my big hitch, and buy some lighter weight, shorter spring bars and hook up brackets. I can't find short, trunnian style bars, and this seems like over-kill for this just over 2000 lb trailer. I pull with a Yukon XL and I do not know the tongue weight of this trailer.