Hmmm, guess it depends upon the truck/trailer and driver.
I don't use a WDH, so no sway control. The trailer is 24', 4000# loaded with 500# on the tongue. The truck is a 2011 F150 with 145" wheelbase weighs 6500# loaded. We've gone to Florida and back twice, and all around Ontario with no problems.
But I know another guy with the same trailer and a Tundra who insists on using a WDH with good sway control.
Not sure what the difference is. Maybe the truck to trailer weight ratio? Also, I have switched the truck to LT tires and beefed up the wimpy suspension. And I only go ~ 60mph. Maybe all that helps. Dunno.
2014 ORV Timber Ridge 240RKS,8500#,1250# tongue,44K miles
690W Rooftop + 340W Portable Solar,4 GC2s,215Ah@24V
2016 Ram 2500 4x4 RgCab CTD,2507# payload,10.8 mpgUS tow