Weight Distribution Hitch With 4-Point Sway Control

What is the Equal-i-zer Sway Control Hitch?

The Original Equal-i-zer® is a weight distribution hitch with integrated 4-point sway control. Its spring arms redistribute trailer tongue weight while friction at the hitch head and L-brackets helps resist side-to-side trailer sway.

Equal-i-zer models cover a broad range of bumper-pull towing applications. Select the correct model using actual loaded trailer weight and tongue weight together with the ratings and requirements of the tow vehicle, receiver, and trailer.

Which Equal-i-zer Hitch Size Do I Need?

The correct Equal-i-zer model depends on the trailer’s loaded tongue weight and gross trailer weight—not simply its dry or unloaded weight. Start with realistic travel-ready weights, confirm all tow-vehicle and receiver limits, then select the approved hitch configuration that accommodates the setup.

Estimate or measure loaded trailer weight.

Determine loaded tongue weight.

Check tow-vehicle and receiver limits.

Select the Equal-i-zer model whose approved limits accommodate the setup.

Confirm trailer-frame and shank requirements.

Install and adjust the hitch according to the appropriate owner’s manual.

Use the Hitch Size Calculator and Shank Size Calculator, then review the existing SKU table in the Specs tab. Selecting the next-largest hitch is not automatically better.

Equal-i-zer Hitch FAQs

Does the Equal-i-zer Hitch provide both weight distribution and sway control?

Yes. The Original Equal-i-zer combines weight distribution with Integrated 4-Point Sway Control® in one hitch system.

How do I choose the correct Equal-i-zer Hitch size?

Use actual loaded tongue weight and gross trailer weight. Verify that the tow vehicle, receiver, trailer, hitch, and related components remain within their approved ratings. Start with the site’s Hitch Size Calculator.

What causes the four points of sway control?

Two friction points occur in the hitch head where the spring-arm sockets rotate, and two occur where the spring arms contact the L-brackets.

Can I back up with an Equal-i-zer Hitch connected?

Yes, when properly installed and used within the system’s limits. Follow the owner’s manual for your model. The 6K–14K manual requires disengaging weight distribution before towing or backing across a significant grade transition that puts excessive strain on the hitch, such as from a flat street to a steep driveway. Read the 6K–14K operator-safety instructions and your model’s manual before towing.

Does an Equal-i-zer Hitch eliminate all trailer sway?

No towing product should be treated as eliminating every possible cause of sway. Proper trailer loading, tongue weight, tire condition, speed, tow-vehicle setup, weather, and correct hitch adjustment all remain important.

Details

Weight Distribution With Integrated Sway Control

The American-made Original Equal-i-zer® brings weight distribution and Integrated 4-Point Sway Control® together in one towing system.

Why Weight Distribution Matters

When trailer tongue weight is applied behind the rear axle, the rear of the tow vehicle can settle while load is removed from the front axle. Properly configured weight distribution transfers part of that load toward the tow vehicle’s front axle and trailer axles, helping restore a more balanced towing setup.

Choose and Adjust for Your Loaded Setup

Weight distribution depends on correct hitch sizing and adjustment. Use realistic loaded trailer and tongue weights, confirm tow-vehicle and receiver limits, and follow the owner’s manual for your hitch model. Recheck adjustment when the tow vehicle or loaded configuration changes.

Find your Equal-i-zer hitch size

How 4-Point Sway Control Works

Two rotational friction points at the hitch head and two linear friction points at the L-brackets resist unwanted trailer movement while the weight-distribution system is engaged.

Points 1–2: Rotational Friction at the Hitch Head

Two rotational friction points are created where the spring-arm sockets rotate inside the hitch head. These points work with the spring arms and frame brackets as part of Integrated 4-Point Sway Control®.

Points 3–4: Linear Friction at the L-Brackets

Two linear friction points are created where the spring arms contact the rigid L-brackets. Together, the four friction points resist unwanted side-to-side trailer movement while the weight-distribution system is engaged. Proper loading, sizing, and adjustment remain essential.

Specifications & Configuration

Use the approved SKU table below to compare hitch ratings and dimensions. Confirm the selected shank and hitch-ball options before ordering, and follow your model’s owner’s manual for installation and operation.

Specifications

See the table below for specification information by SKU. Click on an SKU in the table to load that model.

All models:

Pre-Installed Hitch Ball Size: 2-5/16″ hitch ball on all models, except the 90-00-0400 (4,000 lb model)
Shank Length: 12″ (optional / when selected)
Sway Control Bracket Positioning: 27″ – 32″ back from center of coupler

Model Number	Max Tongue Weight	Max Gross Towing Weight	Max Trailer Frame Height	Maximum Rise	Maximum Drop	Spring-bar Dimensions
90-00-0400	400 lb	4,000 lb	5″	7″ from top of hitch receiver opening	3″ from top of hitch receiver opening	36″ long x 1″ wide
90-00-0600	600 lb	6,000 lb	6″	7″ from top of hitch receiver opening	3″ from top of hitch receiver opening	36″ long x 1-1/4″ wide
90-00-1000	1,000 lb	10,000 lb	6″	7″ from top of hitch receiver opening	3″ from top of hitch receiver opening	36″ long x 1-3/8″ wide
90-00-1200	1,200 lb	12,000 lb	6″	7″ from top of hitch receiver opening	3″ from top of hitch receiver opening	36″ long x 1-1/2″ wide
90-00-1400	1,400 lb	14,000 lb	6″	7″ from top of hitch receiver opening	3″ from top of hitch receiver opening	36″ long x 1-1/2″ wide
90-00-1600	1,600 lb	16,000 lb	8″	5.9″ from top of hitch receiver opening	2.9″ from top of hitch receiver opening	35.5″ long x 1-1/2″ wide

What’s Included

Weight Distribution Shank
Patented Weight Distribution Head
2 Sway Control Brackets
2 Spring Bars
2-5/16″ Pre-installed hitch ball on all models except 90-00-0400
Snap-up Lever
Spacer Rivet and Washers
Hitch Pin and Clip
Necessary Installation Hardware
Limited Lifetime Warranty

One Hitch System

Integrated 4-Point Sway Control® works with weight distribution without a separate add-on friction sway bar. Use the model’s instructions for installation, hitching, unhitching, and maintenance.

Driving Conditions Still Matter

Adjust driving to road, traffic, and weather conditions. Integrated sway control does not remove the need for proper loading, tire condition, speed selection, and an appropriately rated towing setup.

Backing and Turning

Follow the backing and turning guidance in your model’s owner’s manual. Confirm bracket placement and spring-arm clearance. The 6K–14K operator-safety instructions require disengaging weight distribution across significant grade transitions that put excessive strain on the hitch.

Read your model’s owner’s manual

A Custom Fit for All Trailers

The Equal-i-zer hitch is engineered to work with virtually all bumper-pull trailers, including RV, horse, cargo, boat, and utility trailers, including trailers with surge brakes.

The Equal-i-zer hitch’s 4-Point Sway Control™ brackets bolt directly on the trailer frame without drilling. This unique design of the sway control brackets allow flexible placement on the trailer frame. This provides ease of installation around tongue jacks, propane tanks and other items bolted to the trailer frame. Our standard trailer brackets fit up to a 6″ trailer frame. We also have brackets for 4-3/8″, 8″ and 10″ frames to accommodate BAL Norco frames, newer lightweight aluminum, or tall I-beam trailer frames.

Equal-i-zer shanks are available in a variety of sizes which provides a custom fit for virtually every receiver height. Visit our Shank Sizes page to find out which shank is best for you.

Learn how to choose the correct Equal-i-zer hitch model for your set up, by reading: Which Equal-i-zer Hitch Model Do I Need?

If you have questions about your unique trailer application, please feel free to contact us.

Equal-i-zer® Hitch