I use a harbor freight tools special. A copy of, or who knows, the Curtis hitch. Yes chains. Sway bar? No! With my ?4800?lbs cargo trailer. (Last run on the scale, 2200 is curb weight).
Sway control is a feel good item!!! If you have Sway, stop and reload, paying more attention to tongue weight! Only two of the many trailers I have owned swayed. Both had a Sway bar added to try and fix the problem that was only cured by proper loading. I sold the Sway bars as soon as the problem was fixed, and had no further problems.
My opinion is do what makes you feel good!!!