Pulsing the trailer brakes and/or adding throttle power to swaying trailers helps to straighten them out. Unfortunately, sometimes trailer sway happens when already slowing for something happening ahead of the driver and adding throttle may not be a viable choice. Big enough tow vehicles are the best option to prevent sway with a good WDH with sway control.
Bob and sometimes - Nina - a Staffordshire Terrier/a SPOILED pit and her kitty Spaz
2006 Dodge SLT 2500 4x4 Cummins Quad Cab w/AT and 3.73
2007 Salem Sport LE 26FBSRV (TH) w/ my Victory Motorcycle in it or a EZ GO Shuttle cart.