The 60/40 Rule — What It Means and Why It Works

The 60/40 rule means that 60% of your total cargo weight should sit in the front half of the trailer (ahead of the axle), and 40% should sit in the rear half (behind the axle). This distribution produces a tongue weight of approximately 10–15% of the total trailer weight — the sweet spot for stable towing.

The physics: any weight placed in front of the axle acts as a lever that presses down on the hitch ball. Any weight placed behind the axle lifts the tongue. Loading too much weight in the rear reduces or eliminates tongue weight, making the trailer unstable at highway speed. Loading all the weight in the front produces excessive tongue weight that overloads the tow vehicle's rear suspension.

Step-by-Step Loading Procedure

1. Start With the Heaviest Items

   Load the heaviest single items first. Place them on the trailer floor as close to the axle as practical, and centered left-to-right. Low center of gravity reduces the tendency to tip and reduces the effective pendulum arm that drives sway. A heavy item placed high at the rear of the trailer is the worst possible configuration.

2. Apply the 60/40 Rule

   Once heavy items are placed, think about your total cargo weight and mentally divide the trailer at the axle. Roughly 60% of total weight should be forward of that line. On a single-axle trailer, this line is under the axle tube. On a tandem axle trailer, this line is between the two axles. Practical application: if you're loading 3,000 lbs of gravel, try to get about 1,800 lbs into the front section and 1,200 lbs into the rear.

3. Balance Left to Right

   Weight must be evenly distributed between the left and right sides of the trailer. An off-center load tilts the trailer sideways, overloads one side of the axle and tires, creates uneven braking performance, and puts asymmetric stress on the trailer frame. Use the axle centerline as your balance point and keep loads symmetric.

4. Fill Gaps to Prevent Shifting

   Items that have open space around them will move during travel — particularly during braking and cornering. Fill gaps with blocking material, use load bars across the trailer bed, or pack items tightly together. A 500 lb load that shifts 3 feet to the rear during hard braking can change your tongue weight by 100+ lbs — turning a stable setup into a sway-prone one.

5. Secure With Proper Tie-Downs

   Use ratchet straps or load chains rated for the load weight. The working load limit of your tie-downs must cover the item being secured. Cross-strap heavy items front-to-back and side-to-side. Secure straps cannot stop a load from shifting forward under hard braking unless the straps have significant angle — use front-of-trailer anchor points for forward restraint on heavy items.

6. Verify Tongue Weight Before Leaving

   Before your first trip with a new load configuration, verify tongue weight by one of the methods in our tongue weight guide. If you don't have a scale, at minimum confirm the rear of the tow vehicle squats noticeably when you hitch up — minimal squat indicates low tongue weight that may cause sway.

7. Stop and Check at 15 Minutes

   After 15 minutes of towing (or the first stop), inspect the load. Check that nothing has shifted, that all straps are still tight, and that the trailer is riding level. Loads settle during initial towing and straps can lose tension — a check-stop prevents discovering a problem at highway speed.

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Frequently Asked Questions