Definetly go with the Max Brake, or Brake Smart, there is no subsitution for these brake controlers. I wouldn't think that you will need air bags or any suspension add ons, just make sure the shocks are in good condition, unless you will be hauling any significant amount of weight in the box. Also make note of your tires, make sure the sidewall ply rating is up there, this makes a serious difference in swaying of the trailer since if the side wall give a little in a sidways motion, the trailer will exagerate that in the fish tailing. Seeing the tires that you mention in your sig, I know nothing about them. Some of those wider tires accually have a higher load rating than regular tires, but I don't know about sidewall quality. Not fun, I had this happen with a dually that has air bags, swaybar and the whole nine yards, the tire sidewalls were the culprit. When it comes time to get new tires, be aware of the load rating and side walls. Don't put heavy things in the back half of the trailer, this will help with the handling on a travel trailer.
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