Red Seal Transport Trailer Technician Practice Exam

What is a major cause of trailer sway during operation?

1. Improper tire pressure

2. Incorrect brakes

3. Improper weight distribution or high winds

4. Overloading the trailer

The correct answer is: Improper weight distribution or high winds

Trailer sway is significantly influenced by improper weight distribution or high winds during operation. When the weight within a trailer is distributed unevenly, it can shift while in transit, affecting the trailer's balance and stability. This imbalance can lead to lateral movement and sway, particularly at higher speeds or when cornering. Additionally, high winds can exert substantial force on the sides of a trailer, especially if it's tall or has a large surface area. The combination of uneven weight distribution and external wind forces can easily initiate sway, making it difficult for the driver to maintain control. While other factors like tire pressure, brake performance, and trailer loading certainly affect overall towing safety and performance, the direct relationship between weight distribution and aerodynamic influences such as wind makes them the primary causes of trailer sway during operation.