Short story to show why WDH is important. Last year my buddies and I took a trip together. My Roo21ss hitched to 08 Silverado, Husky WDH and sway control arm. HIM, older 24' Prowler hitched to 09 Dodge Ram, no WDH or sway. Coming home, we hit one of the wind storms NM is famous for. My rig, steady as a rock, no worries, maintained 55MPH. BUT ended up doing top speed of 40MPH, behind my buddy, while he white knuckled his fishtailing rig all the way home.