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  1. Weight Distribution Hitch
  2. Equal-i-zer
  3. 1000 lbs
  4. 1100 lbs
  5. Fits 2 Inch Hitch
  6. WD With Sway Control
Equal-i-zer Weight Distribution w/ 4-Point Sway Control - No Shank - 12,000 lbs GTW, 1,200 lbs TW
Equal-i-zer

Equal-i-zer Weight Distribution w/ 4-Point Sway Control - No Shank - 12,000 lbs GTW, 1,200 lbs TW

Part Number: EQ37121ET
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$751.75
Weight Distribution Hitch
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Steel-on-steel friction works to prevent and correct trailer sway in this unique weight distribution system. Sway control brackets ensure that your trailer stays in line with your tow vehicle. Shank sold separately. 2-5/16" Hitch ball included. Great Prices for the best weight distribution hitch from Equal-i-zer. Equal-i-zer Weight Distribution w/ 4-Point Sway Control - No Shank - 12,000 lbs GTW, 1,200 lbs TW part number EQ37121ET can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Equal-i-zer Weight Distribution Hitch - EQ37121ET

  • 1000 lbs
  • 1100 lbs
  • Fits 2 Inch Hitch
  • WD With Sway Control
  • Allows Backing Up
  • Equal-i-zer
  • Shank Not Included
  • Some Sway
  • Electric Brake Compatible
  • Surge Brake Compatible

Steel-on-steel friction works to prevent and correct trailer sway in this unique weight distribution system. Sway control brackets ensure that your trailer stays in line with your tow vehicle. Shank sold separately. 2-5/16" Hitch ball included.


Features:

  • Evenly distributes weight over axles of tow vehicle and trailer for stability and control
    • Creates a level ride for both tow vehicle and trailer
  • Integrated 4-Point Sway Control limits side-to-side movement
    • Brackets keep spring bars in place for a rigid system that holds trailer in line
    • Steel-on-steel friction helps to minimize sway caused by winds or sudden maneuvers
    • No lift chains - eliminate unwanted movement
  • Unique design makes system compatible with surge-type brake actuators
  • Spring bars flex for a controlled, even ride
    • Constructed of chromoly steel for superior dexterity and spring
  • No-drill, clamp-on brackets can be adjusted along the trailer frame
    • Accommodates frame-mounted items such as gas tanks, battery boxes, toolboxes, or generators
  • Desired tilt is achieved with traditional washer design
    • Add or remove washers from spacer rivet to tilt head up or down
  • Dipped steel construction is durable and corrosion resistant
  • Snap-up lever eases installation by reducing lifting required by trailer jack
  • System includes head assembly, spring bars, sway control brackets, hitch ball, lift handle, and all necessary hardware
    • Adjustable shank sold separately
    • 1-7/8" Thin walled socket (EQ70-00-4800 - sold separately) recommended for hitch ball installation
  • Made in the USA


Specs:

  • Tongue weight: 800 lbs - 1,200 lbs
  • Gross towing weight: 12,000 lbs
  • Ball size: 2-5/16"
  • Fits: 2" x 2" trailer hitch receivers rated for use with weight distribution systems
  • Sway control bracket positioning: 27" - 32" back from center of coupler
  • Maximum trailer frame height: 6"
  • Spring bar dimensions: 36" long x 1-1/2" wide
  • Limited lifetime warranty


Included w/ SystemRequired - Sold SeparatelyOptional Add-Ons

90-00-1201 Equal-i-zer Weight Distribution Hitch

  • Weight Distribution Head
  • 2-5/16" Chrome Hitch Ball
  • 2 Sway Control Brackets
  • 2 Spring Bars
  • Snap-up Lever
  • Spacer Rivet and Washers
  • Necessary Installation Hardware
  • Adjustable Shank
  • Thin Walled Socket for Installation of Hitch Ball

Weight Distribution Diagram

Create a more stable ride for your tow vehicle and trailer with a weight distribution hitch. Adding spring bars to your towing system applies leverage, which transfers the load that is pushing down on the rear of your vehicle to all the axles on both your tow vehicle and your trailer, resulting in an even distribution of weight throughout. The result is a smooth, level ride, as well as the ability to tow the maximum capacity of your hitch.



Selecting a Weight Distribution System

The tongue weight rating is the most important factor in determining which size weight distribution system you should use. If the bars of the system you choose are rated too high for your setup, they will create a rigid ride, which can result in a bouncing trailer. If, on the other hand, the bars are not rated high enough, the system will be unable to properly distribute the weight, rendering it virtually useless.


To determine the proper weight rating for a weight distribution system, you must first determine your trailer's tongue weight. Then add to that the weight of the cargo behind the rear axle of your tow vehicle. These two measurements make up the tongue weight rating for a weight distribution system.


Features of the Equal-i-zer

Head Tilt Adjustment

Controlling head tilt with traditional washer method

The Equal-i-zer weight distribution system uses the traditional washer-style adjustment method to achieve the perfect tilt. Controlling the head tilt helps you to fine-tune the leverage on your entire system, making it easier to install and hook up the spring bars. To adjust the tilt, simply slide washers onto the spacer rivet and insert the rivet into the head assembly. To increase the angle, add a washer. To reduce the angle, remove a washer. Most setups take four to six washers to achieve the proper height. Once you get the desired tilt, insert the shank bolts to secure the head to the shank (sold separately) and then tighten it in place.



Construction of Spring Arms

The Equal-i-zer spring bars are not made of traditional spring steel. Rather, they are constructed of a chromium-molybdenum alloy steel. Chromoly steel has a high tensile strength for extreme durability. It also features excellent dexterity, which allows it to give as required and then return softly back to its original form. This pliability is important in minimizing trailer bounce while still ensuring that the weight of your rig is adequately distributed.


Fixed Sway Control Brackets

Installation of Sway-Control Brackets

The unique sway control brackets of the Equal-i-zer are easy to install and simple to use. They clamp onto your trailer frame and conveniently adjust to a position anywhere between 27 inches and 32 inches back from the coupler. These brackets provide the attachment points for the weight distribution spring bars. To position the spring bars during hookup, simply use the included snap-up lever to lift each bar into place on the L-shaped brackets. Then secure the bars in place with the included L-pins and clips.


Equal-i-zer Hitch 4-Point Sway Control

The Equal-i-zer weight distribution system works to stop trailer sway before it begins. This is achieved through the rotational friction that is present in the weight distribution hitch itself. Within the system head, the downward pressure that is placed on the hitch ball by the trailer is combatted by the upward pressure exerted by the spring bars that are mounted in the sockets. This upward force is placed on the spring bars on either side of the system, creating the rotational friction that, essentially, forces your trailer in line. This type of friction is responsible for two points - one on either side of the trailer - of the 4-Point Sway Control. To ensure that enough tension is present, make certain that the socket bolts in the head assembly are torqued to at least 45 foot-pounds.


Points within the Equal-i-zer system where upward and downward forces interact to create rotational friction

The other two points of sway control are created by the steel-on-steel friction that occurs when the spring bars slide within the L-brackets that are mounted on the trailer tongue. Most traditional weight distribution systems have spring bars that are suspended by chains. Although this ensures that the system is not so rigid as to create bounce in the trailer, it also allows a good deal of side-to-side play in the system. Letting the spring bars hang freely minimizes the rotational friction described earlier. It also eliminates your system's ability to create the type of direct friction that has been shown to be so effective in limiting trailer sway.


This direct friction that is applied to the spring bars in the Equal-i-zer system helps to stop sway once it has begun. The concept is similar to the way in which an add-on friction sway control device functions. When each spring bar moves forward or backward, or side to side, it rubs along the bracket, creating friction. The resistance created by this action limits the movement of the spring bar, thus preventing further side-to-side movement of the trailer.


Most add-on units feature some sort of friction material similar to that used in automotive brakes. But the Equal-i-zer uses direct steel-on-steel contact to create resistance. This is the same sort of friction that is used with locomotives that pull loaded railcars weighing tons. No additional materials are needed. The steel will outlast any of those other materials, providing an extremely durable, functional sway control system.



EQ37121ET Equalizer Weight Distribution Hitch with Hitch Ball, without Shank - 12K

Installation Details EQ37121ET Installation instructions



Customer Satisfaction Score:


Customer Reviews

Equal-i-zer Weight Distribution w/ 4-Point Sway Control - No Shank - 12,000 lbs GTW, 1,200 lbs TW - EQ37121ET

Average Customer Rating:  4.8 out of 5 stars   (786 Customer Reviews)

Steel-on-steel friction works to prevent and correct trailer sway in this unique weight distribution system. Sway control brackets ensure that your trailer stays in line with your tow vehicle. Shank sold separately. 2-5/16" Hitch ball included.

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See what our Experts say about this Equal-i-zer Weight Distribution Hitch

  • Weight Distribution Hitch for 24-Foot Enclosed Trailer with Limited Frame Clearance
    You could use a friction sway control device like # 83660 to help control the sway effects caused by passing trucks, but with a 24-foot enclosed trailer that has a lot of surface area for wind to push on, you will get much better results with a weight distribution system that has built-in sway prevention. These perform much better, and they also allow you back up the trailer without having to disconnect the sway arm. All friction arm units must be disengaged before you try to back up the...
    view full answer...
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  • Recommended Weight Distribution System and Sway Control for 2018 Jayco 324BHTS Travel Trailer
    Your 2018 Jayco 324BHTS has a GVWR of 10,950 lbs with a dry weight of 8,605 lbs and dry hitch weight of 935 lbs. When looking for the best weight distribution system, you first need to determine the total tongue weight which will be your completely loaded tongue weight as well as any cargo behind the rear axle of your Ram truck. My recommendation for the best system to meet your needs is the Rees Strait-Line Weight Distribution w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs...
    view full answer...
  • Recommended Weight Distribution Hitch for 2024 Airstream Flying Cloud 30FB Office
    Hi Eric; based on the specs of your trailer I recommend the Equal-i-zer Weight Distribution w/ 4-Point Sway Control # EQ37121ET. It looks like the Office is the 30FB with an unloaded tongue weight of 900 lbs. Based on that and the GVWR of 8,800 lbs you will likely end up just under 1,200 lbs of tongue weight fully loaded. However, I recommend measuring with a scale like the # e99044 just to be sure. The Equal-i-zer # EQ37121ET has a tongue weight range of 800-1,200 lbs so it will have...
    view full answer...
  • Troubleshooting Sway on Trailer that Starts at 65 MPH
    If you are getting persistent sway at 65 mph a weight distribution system will not be the correct solution. You most likely either have not enough tongue weight or a worn out suspension component that is causing the sway. Does it seem to be any different when you take out the sand bag? Is there any combination that allows the trailer to tow better like with or without water, or with or without the sandbags. Is the trailer sitting level when loaded? Sometime a nose high trailer will have...
    view full answer...
  • Weight Distribution Recommendation for a 2024 Jayco Flight 284BHS
    Hey Travis, congrats on the new 2024 Jayco Flight 284BHS! Your travel trailer looks to have a GVWR of 7,950 lbs so I recommend going with the Equal-i-zer Weight Distribution w/ 4-Point Sway Control # EQ37121ET and pairing it with the Shank # EQ90-02-4900 which fits a 2-1/2" hitch receiver. If your 2021 F-450 is equipped with a 3" receiver then you'll also need the Reducer Sleeve Kit # e33YR. The Equal-i-zer brand is the most well-known out there and it's backed by quality products which...
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  • Recommended Weight Distribution Hitch For 36' 2022 Palomino Puma Pulled By Lifted Ram 2500
    I recommend the Equal-i-zer Weight Distribution # EQ37121ET for towing your 2022 Palomino Puma travel trailer with your 2020 Ram 2500 Power Wagon. This hitch is rated for trailers with a tongue weight of 800-1,200lbs and total trailer weight up to 12,000lbs. To determine the correct drop shank you will need to measure the height of your receiver and compare that with the height of the coupler on the Puma. We have the following drop shanks that will fit your 2-1/2" receiver. 2-1/4" to...
    view full answer...
  • Recommended Weight Distribution Hitch System for a 2010 Forest River Salem 36BHBS Travel Trailer
    I recommend using the Equal-i-zer Weight Distribution System # EQ37120ET with your 2010 Forest River Salem 36BHBS. This particular system is rated for a trailer up to 12,000lbs with a tongue weight of 800-1,200lbs and has a maximum drop of 3". Your Salem will have left the factory with 720lbs of tongue weight and a maximum GVWR of 10,880lbs. Once the dealer filled the propane tanks with 60lbs of propane and installed a 50lb battery on the tongue this will put you at 830lbs before you add...
    view full answer...
  • Recommended Weight Distribution System for a 7,500 lbs Travel Trailer and a Lifted Truck
    Thanks for the pictures! A weight distribution hitch is recommended based off of the tongue weight of your trailer and is typically between 10% and 15% of your trailer's total weight. 580 lbs seems extremely low for a 7,600 lbs trailer. Usually we would see a tongue weight range of 760 lbs - 1,140 lbs. I am going to recommend two systems based off of your 580 lbs tongue weight and the 10% - 15% range I have suggested. Both systems are capable of backing up and will be compatible with...
    view full answer...
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  • Comparing Trunnion Vs. Round Spring Bars for Weight Distribution Systems
    There are two different types of spring bars for weight distribution systems, round like part # FA94-00-1033 and trunnion like part # EQ37121ET. The trunnion spring bars start out square and taper down. The round spring bars are round from start to finish. The main difference between them is ground clearance. The trunnion spring bars provide more ground clearance than the round spring bars. I am not aware of any significant differences in performance.
    view full answer...
  • Recommendation On Equal-i-zer Weight Distribution HItch
    When it comes to The Equal-i-zer Weight Distribution w/ 4-Point Sway Control - No Shank - 12,000 lbs GTW, 1,200 lbs TW # EQ37121ET, The Equal-i-zer Weight Dist Shank - 2-1/2 inch Hitch - 8 inch Rise, 4 inch Drop # EQ90-02-4800 will work together. The shank slides into your hitch receiver and provides the attachment point for your weight distribution system's head assembly. It has a maximum tongue weight up to 1,600 pounds and has a maximum gross towing weight up to 16,000 pounds. The...
    view full answer...
  • Correct Equal-i-zer Weight Distribution System for 8,500 lb GVWR Trailer
    The correct Equal-i-zer Weight Distribution System for a trailer with 8,500 lb GVWR is 12K, part # EQ37120ET for 2" shank or part # EQ37121ET for 2-1/2" or 3" shank. If you have a 2-1/2" receiver then you will also need the Equal-i-zer Weight Dist Shank part # EQ90-02-4700. If you have a 3" receiver then you will still need the Equal-i-zer Weight Dist Shank but you will need to use your 3" to 2" adapter as well, you can use your 2-1/2" to 2" adapter if you have a 2-1/2" receiver. There...
    view full answer...
  • Class IV Weight Distribution Hitch With Sway for 2019 Venture SportTrek 38 Travel Trailer
    First you will want to confirm what your tongue weight is that you will be towing with. You can do this with a tongue weight scale like the etrailer scale # e99044. This will ensure that you have a weight and sway distribution hitch that is correct for your 2019 Venture SportTrek travel trailer. This device will plug into the OBD II port on your 2017 Ford F-250 and will tell you the tongue weight of your camper as well as help you setup the new weight and sway hitch. For tongue weights...
    view full answer...
  • Do 1,200 lbs Equal-i-zer Spring Bars Fit in a 1,400 lbs Equal-i-zer Head?
    I have a solution for you but the spring bars are a slightly different size, so in order to go from 1,400 lbs spring bars to the 1,200 lbs Spring Bars for Equal-i-zer item # EQ90-01-1299 you would also need to get a new head unit. You will want the 1,200 lb Replacement Head for Equal-i-zer Weight Distribution Systems item # EQ90-02-1200.
    view full answer...
  • Can I Use a Weight Distribution System w/ Air Bags?
    Yes, you can use a weight distribution system on your Ram 2500 with air suspension. You will want to make sure your air bag system is set to its lowest capacity or 10% when you are hooking up your trailer. You will then set the weight distribution system up so your truck and trailer are level. For your travel trailer with a 1,050 lbs tongue weight I recommend the Equal-i-zer Weight Distribution w/ 4-Point Sway Control item # EQ37121ET. This system has a tongue weight range of 800 lbs -...
    view full answer...
  • Will The Friction Points On A Weight Distribution System Ever Wear Out?
    There are a few weight distribution systems, like the Reese Steadi-Flex # RP66558, that use actual friction pads that are similar to a brake pad that will wear out over time, but typically this is not something that you need to worry about with other systems. As another example, the Equal-i-zer # EQ37121ET is constructed from chromoly steel and will not be an issue. However, due to Newton's 3rd Law of Motion, I cannot say it will never happen, but I have never actually seen it and there...
    view full answer...
  • Will the Blue Ox SwayPro # BXW4028 Work with a E2 Equal-i-zer Hitch?
    Yes, the Blue Ox SwayPro Weight Distribution Shank # BXW4028 will be able to accommodate a E2 Equal-i-zer hitch like the # EQ37121ET.
    view full answer...
  • Equal-I-Zer Weight Distribution System Vs. Reese Strait-Line Comparison and Recommendation
    The two systems you mentioned are basically the two best systems available for weight distribution. Either one will work great for you as long as it is properly rated for your setup and is properly installed/set up. Personally I like the Reese Strait Line system since they use spring steel for the spring bars that are designed to bend and then go back to their original shape. Equalizer bars will still flex back too but since it's not spring steel it will be a more rigid flex. I also like...
    view full answer...
  • Equal-i-zer Weight Distribution Shank With 9" Drop And Tongue Weight Capacity Over 1,500lbs
    The Equal-i-zer Weight Distribution # EQ37121ET uses a shank that has bolt holes with a 1-1/4" height adjustments. The Equal-i-zer Weight Distribution Shank # EQ94FR would be ideal to use as it has a 9" maximum drop and fits into the 2-1/2" receiver on your 2019 Ram 2500. It has a maximum tongue weight of 1,600lbs and trailer weight of 16,000lbs. The Equal-i-zer Weight Distribution Shank # EQ34FR has a maximum drop of 12" or a minimum drop of 8-1/4". It has 4 different drop positions...
    view full answer...
  • Which Equal-i-zer Weight Distribution for 8000 lb GVWR Travel Trailer
    Since tongue weight is approximately 10 to 15% of the trailer's fully loaded and ready to tow weight, let's start out with the premise that your Imagine 2500 RL has a tongue weight between 800 and 1100 lbs. In that case, I can highly recommend the Equal-i-zer # EQ37121ET which is specifically designed for trailers with a tongue weight between 800 and 1200 lbs (make sure you include cargo stowed in the truck bed behind the rear axle as tongue weight). The system includes the 2-5/16 inch...
    view full answer...
  • Difference Between Equal-I-Zer Weight Distribution Systems EQ37121ET and EQ37100ET
    There's a couple key differences between the Equal-I-Zer Weight Distribution systems # EQ37121ET and # EQ37100ET that you referenced. The biggest being that the tongue weight range is different. The part # EQ37100ET has a range of 600-1,000 lbs and includes a shank whereas the part # EQ37121ET has a range of 800 lbs - 1,200 lbs and does not include a shank. The best way to pick out a weight distribution system is to base it off of the loaded tongue weight of the setup when it is loaded...
    view full answer...
  • Availability Of Sway Control Without A Weight Distribution Hitch For Truck W 10 Drop Ball Mount
    There sure is! Based on the picture you provided you are using an adjustable ball mount that does not use a standard hitch ball with a nut on the bottom. Since that is the case you will not be able to use friction sway control, as it needs to be installed underneath the nut. Instead I recommend using the Tuson Asymmetric Sway Control # 335TSC-1000 which wires into your trailer and does not require any brackets like friction sway control. This system uses a constantly monitors to detect...
    view full answer...
    Image 1 for
  • Recommended Sway Control/Weight Distribution for Trailer With 1500-2000 lb Tongue Weight
    The best way to proceed is to definitively identify the tongue weight of the trailer when it's loaded as it typically would be when you tow. I'll link to an article that explains a few ways to do this, but the easiest method is to use a tongue weight/payload scale like the etrailer, part # e99044. I attached a video and an article to help you with this. Equal-i-zer weight distribution hitches are what I most often recommend, because of how well they're constructed and how amazingly well...
    view full answer...
  • Is the Hitch Ball Pre-Installed in the Weight Distribution Head of the Equal-I-zer System?
    The Equal-i-zer weight distribution systems like # EQ37121ET come with the hitch ball needed, but do not come pre-installed. You will need to use a thin walled socket like # ALL643216 or # EQ70-00-4800 to torque it to manufacturer specs.
    view full answer...
  • Are Weight Distribution Systems Only Designed To Be Used With Trucks
    The Equal-i-zer Weight Distribution w/ 4-Point Sway Control part # EQ37121ET fits a 2" hitch so technically any vehicle that has 2" hitch can use the weight distribution system as long as the hitch is rated for the use of weight distribution. All of the Class III hitches that we carry for the Caravan can be used with weight distribution. Weight distribution systems are designed to distribute the weight of the trailer to help keep the trailer in line which helps with sway and bounce. to...
    view full answer...


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