Friction anti-sway device use in rain or wet roads

If you have your trailer properly set up, you may not even need an anti-sway device. When I towed an 11K lb toy hauler, it sat high and had a lot of surface area that could catch wind or wash from vehicles passing me. In this case I used a friction bar to dampen any oscillations that might be induced into the trailer. I now tow an 8K lb enclosed trailer that is not nearly as tall and sits lower to the ground. I have not found a need to install an anti-sway device on this trailer because it is not as affected by wind or passing vehicles. These devices are not mandatory to tow, but in some cases will help with stability when towing in some conditions.