Chapter 12: Towing a Trailer

Safely towing a trailer requires a unique set of skills and knowledge beyond standard driving. The added weight and length of a trailer dramatically change a vehicle’s handling, acceleration, and braking capabilities. Understanding the specific equipment requirements, proper loading techniques, and adjustments to your driving is essential for preventing dangerous situations like trailer sway or collisions, and is a key part of being a responsible and safe driver.

Equipment and Loading

Before towing any trailer, a driver must ensure that both the tow vehicle and the trailer are properly equipped and that the cargo is loaded correctly to maintain stability.

Required Equipment

• Hitch: The hitch must be a ball-and-socket type that is securely mounted to the tow vehicle. It must be strong enough to handle the gross weight of the trailer.
• Safety Chains: Two safety chains are required to connect the trailer to the tow vehicle. These chains must be strong enough to hold the trailer and prevent it from completely separating from the tow vehicle if the hitch fails. The chains should be crossed under the trailer tongue in an “X” pattern and have enough slack to allow for turns, but not so much that they drag on the ground.
• Lights: The trailer must have a functioning lighting system that connects to the tow vehicle. This includes taillights, brake lights, and turn signals that work in sync with the tow vehicle’s lights.
• Trailer Brakes: In Illinois, a separate braking system on the trailer is required if its gross weight is 3,000 pounds or more. These brakes are typically activated electronically by a controller in the tow vehicle’s cab and are crucial for safe stopping.

Proper Loading (The 60/40 Rule)

The single most important factor in preventing trailer sway is proper weight distribution. An improperly loaded trailer is unstable and extremely dangerous.

• The 60/40 Rule: When loading cargo, place approximately 60% of the total weight in the front half of the trailer (ahead of the axle) and 40% in the rear half.
• Tongue Weight: The downward pressure on the hitch ball, known as tongue weight, should be between 10% and 15% of the total loaded trailer weight. Too little tongue weight will cause the trailer to sway, while too much will weigh down the rear of the tow vehicle, lifting the front wheels and impairing steering and braking.

Pro-Tip:
After loading your trailer, check the tongue weight by observing your tow vehicle. The rear of the vehicle should squat only slightly. If the rear bumper is very low and the headlights are pointing up, you have too much tongue weight. If the rear of the vehicle appears higher than normal, you have too little.