Don't fix it if it works. With the proper tongue weight you should not have any sway. I have been on this site for over 7 years and cannot recall any issues with sway. I have a couple of friends with the same truck you have and they have never complained about sway either. Take your rig out for a ride and try it out. Sway is usually caused by improper tongue weight. Tongue weight should be around 10% of the boat and trailer weight combined. Make sure that is within range and you should be fine. When the boat and trailer are attached to the truck the trailer should look fairly even along the ground as should the truck. A large dip or rise at the hitch will indicate improper loading. Sway bars do have their limitations when backing up and depending on brakes (surge) should not be used.