Truck towing a RV trailer on a mountain road

How To Prevent Trailer Sway

Whether you’re a seasoned driver with years of experience or you’re just learning the ins and outs of pulling a trailer, everyone should be aware of the danger of trailer sway and how to prevent it. Trailer sway can happen in a matter of seconds, catch you off-guard, and be very dangerous if not handled properly. Preventing trailer sway from happening in the first place is one of the best ways to avoid causing an accident due to trailer sway. 

What Causes Trailer Sway?

To understand how to prevent trailer sway, sometimes called “fishtailing”, it is important to know why it happens. Trailer sway occurs when a force, like a big gust of wind, causes the trailer to sway side to side. At high enough speeds, the trailer can quickly gain momentum in this swaying motion, and it becomes quite difficult to regain control. A random gust of wind isn’t the only thing that can cause trailer sway. Passing semi-trucks can create a “bow wind” that sends a sudden and intense gust toward the side of your trailer. Uneven road conditions can also contribute to trailer sway, among other factors. 

Steps To Help Prevent Trailer Sway

There are a handful of steps you can take to create a scenario where trailer sway is less likely to occur. 

1. Proper Trailer Weight Distribution

The appropriate weight distribution and load balance can make it less likely for trailer sway to occur. The tongue weight range should be about 10-12% of the total trailer weight. This will help reduce oversteering in the tow vehicle. Load your trailer evenly from left to right and keep most of the weight toward the front of the trailer. About 60% of the total weight should be closest to your vehicle. The more weight there is toward the back of the trailer, the easier it will be for the trailer to get out of control. 

2. Don’t Overload Your Trailer

Your trailer has a maximum weight rating, and if you exceed these limits, it could increase the likelihood of experiencing trailer sway. Pay attention to your overall trailer weight and tongue weight along with your towing vehicle payload and tow ratings. 

3. Use A Tow Vehicle With A Longer Wheelbase

While a truck with a long wheelbase won’t completely resist trailer sway, it will help your vehicle resist the effects a little. With more distance between the wheels of the tow vehicle, it can more effectively counteract the swaying motion. Duallys, or trucks with dual rear wheels, may be even more resistant to swaying due to the added traction of two extra wheels. 

4. Use a Tow Package

If you are purchasing a vehicle, knowing that it will be used for towing, opt for the tow package. By choosing this option, the vehicle will likely come with a hitch, trailer wiring, and upgraded transmission cooling. Certain vehicles will also come with more durable batteries, brakes, and alternators. 

5. Avoid Sudden Movements

Slamming on your brakes, letting off the throttle suddenly, or overcorrecting your steering means you’re just asking for trouble. The stability of your vehicle can have a direct impact on the stability of your trailer. So to avoid these sudden movements, leave plenty of space between you and other vehicles, plan turns in advance, take your time during lane changes, and allow yourself plenty of time for travel, so you never have to be in a rush. 

6. Drive Slower Than Usual

This might be one of the most challenging pieces of advice for some to follow. Once you are on the open road, it can be easy to let your foot get a little heavy, and you don’t notice it until your trailer starts to sway. By then, it is too late. Knowing this ahead of time, you should plan to travel at a slower pace and give yourself the additional time you need to get to your destination safely. 

7. Use A Weight Distribution Hitch

Using a weight distribution hitch is one of the most effective ways to prevent trailer sway. As mentioned earlier, many trailer sway problems are caused by improper weight distribution. So if you remain within your weight ratings, installing a weight distribution hitch like SwayPro by Blue Ox, you can drive with more peace of mind and stop sway before it starts. 

Prevent Trailer Sway with SwayPro

The SwayPro weight distribution hitch prevents trailer sway from happening, rather than trying to control it once it starts. Trunnions on each side of the SwayPro hitch head employ a caster effect, working with spring bars, to constantly push inward, keeping the trailer in line. This built-in sway prevention is safer than traditional friction sway controls that are designed to slow down the trailer sway, but does not bring the trailer back in alignment with the towing vehicle. SwayPro is one of the safest, and most user-friendly sway prevention systems on the market today.