Trailer sway

[pballance]

A couple of thoughts,
What Tom said is absolutely correct. Get the tongue weight right. Then start considering other things.

I am going to guess that if you are pulling the rear end down, even on a 1/2 ton tow vehicle you have TOO MUCH tongue weight and it will also cause trailer sway. Use adjustable height hitches to keep the trailer level or nearly level once you have the proper tongue weight. Too much rake in the trailer will also contribute to sway whether it is single or tandem axle. You don't say if it is single or tandem axle trailer but not keeping it level loads the axles incorrectly and will make the handling terrible.

Just some thoughts for you. Set the trailer up correctly before throwing dollars at sway control, air bags or anything else. The friction type sway control may help, I use trunnion load control bars and cam type sway control but then again I am towing a 24' enclosed trailer.

Good luck and you will find a lot of good information online at the sites like Reese and e-trailer. Be sure to read the instructions to some of the hitch installations and you will learn an enormous amount about proper loading.

YMMV,
Paul

Quick edit. When you mention push, I have to ask if you have electric brakes on the trailer? If not, surge brakes? At the weights you quoted, I would make sure I had electric brakes and a brake controller in the tow vehicle.