Towing a trailer or RV offers a fantastic way to explore the open road, but it comes with its own set of challenges, one of the biggest being trailer sway. When a trailer starts to sway or fishtail, it can create a dangerous situation for both the driver and other vehicles on the road. This is where sway control systems come into play, designed to keep trailers steady and minimize the risk of an accident.
In this article, we’ll dive into the basics of sway control, how it works, and essential tips for maintaining and optimizing sway control systems to ensure a safe towing experience.
What is Trailer Sway?
Trailer sway, or fishtailing, occurs when the trailer behind a towing vehicle begins to move side-to-side, often uncontrollably. This can happen for several reasons, including:
- Crosswinds or strong gusts from passing vehicles.
- Incorrect weight distribution within the trailer.
- Sudden steering changes or overcorrections by the driver.
- High speeds, which make trailers more vulnerable to sway.
Once sway begins, it can be difficult to correct, leading to the possibility of losing control of both the trailer and the towing vehicle. This is why sway control is critical for any towing setup.
How Sway Control Systems Work
Sway control systems are designed to dampen the side-to-side movement of a trailer, keeping it in line with the tow vehicle. These systems come in two main types: passive and active.
- Passive Sway Control: This type of system relies on mechanical friction to resist sway. A friction sway control bar attaches between the trailer frame and hitch, creating resistance when the trailer begins to sway. This resistance dampens the trailer’s movement, helping to bring it back in line with the tow vehicle.
- Active Sway Control: Active systems use electronic sensors and braking systems to detect when sway begins. When sway is detected, the system automatically applies braking pressure to one or more of the trailer’s wheels, helping to correct the movement and stabilize the trailer. Some modern vehicles also have built-in sway control that adjusts braking or torque on the tow vehicle’s wheels.
Essential Tips for Maintaining Sway Control
To ensure your sway control system is working optimally, regular maintenance and proper towing setup are essential. Here are key tips to help you maintain sway control and prevent trailer sway on the road.
1. Check the Weight Distribution
One of the primary causes of trailer sway is improper weight distribution within the trailer. A general rule of thumb is to have 60% of the trailer’s weight placed over the front half (closer to the hitch) to ensure proper balance. If too much weight is placed in the rear, the trailer can easily sway.
For trailers with a weight distribution hitch, make sure the hitch is adjusted properly to keep the trailer level with the tow vehicle. Uneven or unbalanced weight distribution can make sway control systems less effective.
2. Regularly Inspect Friction Sway Bars
If you’re using a passive sway control system with friction sway bars, it’s important to regularly inspect and maintain them. Friction sway bars should be lubricated periodically to prevent wear and to ensure they function properly. Check for signs of wear and tear, such as bent bars or damaged components, and replace them as needed.
When installing or adjusting friction sway bars, be sure they’re set to the proper tension level. Too little tension can reduce their effectiveness, while too much tension can make steering difficult.
3. Ensure Proper Tire Inflation
Underinflated or unevenly inflated tires on either the tow vehicle or the trailer can exacerbate trailer sway. Before every trip, check the tire pressure for both the trailer and towing vehicle and ensure they are inflated to the manufacturer’s recommended levels. Tires should also be inspected for wear, as worn or damaged tires can affect stability and increase the likelihood of sway.
4. Brake Maintenance
For trailers equipped with electronic sway control systems that rely on braking, regular maintenance of the trailer’s brake system is crucial. This includes checking the brake pads, brake fluid levels, and brake controller settings.
Ensure the brake controller in your tow vehicle is properly calibrated. If the brakes engage too slowly, sway may not be corrected in time, while brakes that engage too quickly can cause jerking or overcorrection.
5. Use Sway Control in Conjunction with Weight Distribution
Many experienced RVers recommend combining sway control systems with weight distribution hitches for the best towing stability. Weight distribution hitches help level the trailer and tow vehicle, ensuring that both are properly aligned. When combined with sway control, this system provides enhanced stability and makes for a much smoother ride.
6. Drive Carefully
Even with sway control, safe driving practices are essential to prevent trailer sway. Avoid abrupt steering maneuvers, maintain a safe speed (generally under 55 mph when towing), and be cautious of wind conditions or passing trucks, which can create sudden gusts of wind.
If you notice trailer sway beginning, do not overcorrect by sharply steering or braking. Instead, gently let off the accelerator and keep the steering wheel steady until the sway subsides.
7. Upgrade to an Advanced Sway Control System
If you frequently tow in challenging conditions, such as in high winds or mountainous terrain, consider upgrading to an advanced sway control system. Newer systems that integrate electronic sway control offer automatic intervention when sway is detected, providing a higher level of safety compared to friction-based systems.
When to Replace or Upgrade Sway Control Components
Sway control systems, like any other towing equipment, can wear down over time. It’s essential to replace components that show signs of excessive wear, damage, or rust. If you’ve been towing with a basic sway control bar but have noticed that your trailer still sways more than you’re comfortable with, upgrading to an active sway control system may offer more peace of mind.
Additionally, if you’ve upgraded to a larger trailer, make sure that your sway control system and weight distribution hitch are rated for the new weight capacity. Using equipment not rated for the proper weight can compromise safety and effectiveness.
Conclusion
Maintaining sway control is critical to ensuring safe and smooth towing, especially for those who frequently travel with trailers or RVs. By regularly inspecting and maintaining your sway control system, ensuring proper weight distribution, and following safe driving practices, you can significantly reduce the risk of trailer sway. Whether you’re using a passive friction system or a more advanced electronic sway control, taking proactive steps will keep you, your trailer, and others on the road safer.