Sway Control HELP........

First off make sure the tires on the truck and trailer have the proper air pressure, if not high enough the trailer will push on the sidewalls of the tires and cause problems. The WDH bars are too lightweight which lets the trailer rock front to rear, and won't allow you to transfer the weight back to the front of the truck which lets the front of the truck move around and puts extra weight on the rear tires. With the rig loaded for travel do get it weighed to see where you are. The tongue weight might be low but probably close. When the hitch is set up properly, the trailer should be level front to rear or slightly down in front and the proper amount of weight moved back to the front axle of the truck. After you get the sway problem solved, do get some type of sway control installed to help you if/when the need happens.