The 60/40 rule on trailers is a loading guideline that directs you to place about 60% of the cargo weight in the front half of the trailer (toward the tongue) and 40% in the rear half. This weight distribution helps achieve proper tongue weight, which is essential for stability and prevents dangerous towing conditions such as trailer sway. Following this rule is critical for maintaining control of both the trailer and the tow vehicle, especially at highway speeds.
How the Rule Works
The 60/40 rule dictates that 60% of the cargo’s weight should be positioned in the front half of the trailer (the side closest to the tow vehicle), while the remaining 40% is distributed in the rear half. This configuration ensures that there is adequate “tongue weight”—the downward pressure exerted by the trailer coupler onto the hitch ball. Generally, tongue weight should be approximately 10% to 15% of the total loaded trailer weight.
Why It Matters for Safety
- Preventing Sway: Loading too much weight in the rear of the trailer (less than 60% in the front) can cause the trailer to fishtail or sway violently. This instability can quickly lead to a loss of control and potential jackknifing.
- Maintaining Steering Control: While front-loading is important, excessive weight in the very front can lift the front wheels of the tow vehicle, reducing steering effectiveness. The 60/40 split strikes the perfect balance.
- Tire and Suspension Health: Even distribution prevents individual axles or tires from being overloaded, reducing the risk of blowouts and mechanical failure.
To implement this, always place your heaviest items first, centered over or slightly forward of the axles. Secure all cargo with straps to ensure the weight doesn’t shift during transit, which could instantly negate your careful 60/40 balancing act.
