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  1. Weight Distribution Hitch
  2. Equal-i-zer
  3. 200 lbs
  4. 300 lbs
  5. Fits 2 Inch Hitch
  6. WD With Sway Control
Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 4,000 lbs GTW, 400 lbs TW
Equal-i-zer

Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 4,000 lbs GTW, 400 lbs TW

Part Number: EQ37040ET
In Stock
$800.00
Weight Distribution Hitch
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The best technical support and full weight distribution hitch installation instructions. Great price Viking Express Camper weight distribution hitch and expert service. Coachmen Viking Express Camper, 2018 weight distribution hitch by Equal-i-zer are available from etrailer.com. For expert service call 1-800-940-8924 to order your Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 4,000 lbs GTW, 400 lbs TW part number EQ37040ET, or order online at etrailer.com.
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Equal-i-zer Weight Distribution Hitch - EQ37040ET

  • 200 lbs
  • 300 lbs
  • Fits 2 Inch Hitch
  • WD With Sway Control
  • Allows Backing Up
  • Equal-i-zer
  • Includes Shank
  • Trunnion Bar
  • Top-Mount
  • Fits 3 Inch Frame
  • Fits 4 Inch Frame
  • Fits 5 Inch Frame
  • Fits 6 Inch Frame

The Equal-i-zer has a reputation as strong as its American-made steel. We love this hitch's solid build quality and that it helps to proactively stop trailer sway instead of just dampening it after it starts. Ball and shank included.


Features:

  • Evenly spreads out your tongue weight among all the axles of your tow vehicle and trailer
    • Levels out your ride to restore control and stability
    • Lets you tow to the max capacity of your hitch
  • Built-in sway control stops trailer sway before it begins
    • Maintains tension throughout the entire system
    • Holds your trailer in line with rigid, frame-mounted brackets
    • Uses steel-on-steel friction to combat any sway that occurs
  • Compatible with surge-type brake actuators
  • Desired head tilt is achieved using stackable washers
    • Add or remove washers from the spacer rivet in the hitch head
  • No-drill, clamp-on brackets can be adjusted along your trailer frame
    • Accommodates frame-mounted items such as gas tanks, battery boxes, tool boxes, or generators
  • Chromoly steel spring bars offer superior dexterity for a controlled, even ride without the bounce
  • Dipped steel construction is durable and corrosion resistant
  • System includes head assembly, adjustable shank, spring bars, sway control brackets, 2" hitch ball, lift handle, pin and clip, and all necessary hardware
    • 1-7/8" Thin walled socket (EQ70-00-4800 - sold separately) recommended for hitch ball installation
  • Made in the USA


Specs:

  • Fits: 2" x 2" trailer hitch receivers rated for use with weight distribution systems
  • Tongue weight: up to 400 lbs
  • Gross towing weight: 4,000 lbs
  • Ball size: 2"
  • Sway control bracket positioning: 25" - 32" back from center of coupler
  • Maximum trailer frame height: 6"
  • Shank length:
    • 8" From center of hitch pin hole to center of adjustment holes
    • 9" From center of hitch pin hole to front of shank
    • 7" From center of hitch pin hole to back of shank
    • 12" Overall
  • Total height adjustment along shank: 7-1/2"
    • Maximum rise: 7"
    • Maximum drop: 3"
    • Overall height: 9-1/2"
    • Holes are spaced 1-1/4" apart on center
  • Spring bar dimensions: 36" long x 1" wide
  • Limited lifetime warranty


Dimensions

Included w/ System Required - Sold Separately Optional Add-Ons

90-00-0400 Equal-i-zer Weight Distribution Hitch

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


Pro Tip: Before you invest in a weight distribution hitch, make sure your cargo is evenly loaded in your trailer to keep the weight balanced. If you still have a hard time even after balancing your tongue weight, a weight distribution hitch should help.


Put Trailer Sway on Lockdown

An infographic shows the 4 points of upward and downward forces interacting to create sway control in the Equal-i-zer weight distribution system

  • Other sway control systems reduce sway, but Equal-i-zer's system prevents it
    • System head holds everything tightly in place at the connection point
    • L-brackets hold your trailer in line along the frame
    • Steel-on-steel friction between L-brackets and bars forces trailer back in line if any sway still occurs
  • This system performs extremely well, but it's going to be noisy because of the steel-on-steel design
    • You can lubricate the L-brackets or cover them with special jackets to cut down on the screech, but you'll lose out on some of the sway-reducing friction
    • If superior performance, American-made quality, and noiseless operation are all must-haves in your book, check out the B&W Continuum or the Blue Ox SwayPro instead

Does it seem like no matter where you go, you meet someone who owns - and has vouched for - the Equal-i-zer weight distribution system? There's one really good reason for this: the Equal-i-zer's build quality is second to none. Many companies have tried to imitate it, and they just can't. Sure, they might preempt trailer sway just as the Equal-i-zer does. But for over 75 years, using American-made steel, the Equal-i-zer's unique design has kept haulers from white knuckling the steering wheel.


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

Let's talk about how it does that. Essentially, this system is built to hold your trailer in place both at the connection point and along the trailer's frame. Inside the system head, the trunnions are tightly pinched in place to create resistance. Because the trunnions are held in so tightly in the head, with the help of some torqued socket bolts, once the spring bars are installed, they won't be able to move side to side without a ton of resistance. At the other end of the bars, frame-mounted L-brackets provide a rigid surface that also helps prevent any unwanted movement. Just like the tension in the head, these brackets help hold your trailer in place. All of this tension throughout the system helps to create a rigid steel-on-steel setup that keeps your trailer in line and your ride level.


A close-up image shows where the spring bar grinds on the steel bracket

If a particularly strong wind gust crosses your path and your trailer starts to get off track despite the Equal-i-zer's firm hold, the steel-on-steel friction of the bars on their brackets will stop the bars from moving, and ultimately dampen any remaining trailer sway. Between the 2 friction points inside the system head and the 2 that you get at the L-brackets, the Equal-i-zer creates up to 3 times more side-to-side resistance than other weight distribution systems, or the equivalent of adding 8 friction sway bars. And because you won't need any of those add-on sway bars, you'll actually be able to use this system when towing in the rain or over gravel roads, and you can back up without having to disconnect a thing!


Because the steel-on-steel friction between the bars and brackets is noisy, don't be alarmed if you hear a lot of banging, creaking, and grinding. It's just the system working to correct sway in much the same way that locomotives keep multi-ton railcars from swaying. If the noise becomes too much of an issue for you, there are a few things you can do to address it. You could get some of Equal-i-zer's replaceable nylon sway bracket jackets (EQ95-01-5150). Or you could lubricate any friction points with their high-performance lubricant (EQ91-00-4250). But keep in mind that cutting down on noise isn't the only thing this will do. These quick fixes will limit the system's ability to prevent sway, too.


If you're determined to have a rock-solid towing setup without making any compromises, and you have to have an an American-made weight distribution hitch, and noise is kind of a deal-breaker for you, you may want to spring for the B&W Continuum or the Blue Ox SwayPro instead.


Adjusting the Head Tilt

A close-up image of the Equal-i-zer hitch head shows the rivet and washers during installation

  • Adding washers adds tension, but it's not a case of "the more the merrier"
  • Stacking washers can be a pain, but you only need to do it once, or if your tongue weight changes

Once you've got the hitch ball torqued down, you'll have to adjust the tilt of the head to ensure proper leverage. To do this, simply slide washers onto the spacer rivet and insert it into the head assembly. Once the spacer is in place, tighten the shank bolts to secure the head to the shank. To check if your truck and trailer are level, you'll need to hook up and release your tongue jack. If you find that the rear of your truck is still sagging, add washers to increase leverage. If it looks like too much weight has been taken off your truck's rear axle and is sitting on your front axle, try removing a few washers.


While the washer-stacking method allows you to fine-tune the setup at the time of installation, it's going to require some patience. It can be time consuming because, if you don't get everything right the first time (which, you probably won't), you'll have to take the head unit apart to adjust the washers. You might have to raise or lower the L-brackets too to get the tension just right, and that's a bit of a pain also. Not to mention that you might have to repeat this process if your tongue weight changes or if you swap out your tow vehicle.


Pro Tip: For a step-by-step guide on how to fully install the Equal-i-zer, check out our videos at the top of this page. Our installers even have some advice to offer on measuring your vehicle's squat.


Why Use a Weight Distribution Hitch?

Diagram showing weight distribution on a truck and towing a camper

  • Prevents uneven tire wear on your vehicle and trailer
  • Keeps the rear of your tow vehicle from sagging
  • Lets you tow to the max capacity of your trailer hitch
  • Stops your headlights from pointing up at the sky
  • Gives you control over steering your rig

Selecting the Right Weight Distribution System

  • Think "Goldilocks"
    • If you go for overbuilt, you'll have a rigid ride
    • If it's not strong enough, it's virtually useless
  • Let your tongue weight be your guide

Your tongue weight is the first thing you need to know when figuring out which weight distribution system you need. Most people think that if they get the highest-rated system possible, it'll be smooth sailing. But actually, this will create a rigid ride and a bouncing trailer. On the other hand, if the system isn't strong enough, it won't be able to distribute the weight properly, making it virtually useless.


Once you know your trailer's tongue weight, add it to the weight of the cargo behind the rear axle of your tow vehicle. Then just choose a weight distribution system rated for that combined tongue weight.



EQ37040ET Equalizer Weight Distribution Hitch with Adjustable Shank and Hitch Ball - 4,000 lbs

Compare to Reese 66557

Installation Details EQ37040ET Installation instructions

California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

832 reviews
The Equal-i-zer has a reputation as strong as its American-made steel. We love this hitch's solid build quality and that it helps to proactively stop trailer sway instead of just dampening it after it starts. Ball and shank included.

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Show More Reviews

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

  • Recommended Weight Distribution System for a 2,500 lbs Travel Trailer
    I would be happy to! Weight distribution systems are selected based off of tongue weight which is typically between 10% - 15% of your trailer's total weight. This would put yours between 250 lbs - 375 lbs. There's really only a couple of systems that work with this low of a tongue weight and you do not want to use an overrated one. I recommend the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control item # EQ37040ET. This system works with tongue weights up to 400 lbs so you...
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  • Hitch, Weight Distribution and Brake Controller Recommendations for a 2017 Toyota Sienna XLE
    We can get you everything you need for towing with your 2017 Toyota Sienna XLE. By plastic shield, I believe you are referring to the appearance panel underneath the Sienna, and that will have to trimmed a bit in each of the hitches available for the vehicle. A great Class III hitch would be the Curt # C13105, which is rated for weight distribution and has been given a nearly 5-star review on our site by the over 500 customers that have rated it. As for a brake controller, the wireless...
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  • How to Install a Brake Controller on a 2015 Jeep Wrangler Unlimited with Factory Tow Package
    I have exactly what you will need for your 2015 Jeep Wrangler Unlimited to tow your Vintage Airstream with brakes. The first thing you will want is a 7-way trailer connector at the rear of the vehicle and for this I recommend the Hopkins Endurance Quick-Install 7-Way Trailer Connector part # HM42190 which is a direct plug and play option that will not require you to cut or splice any wires/circuits. The square plug on the end of this connector will plug into and replace the 4-way trailer...
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  • Weight Distribution Recommendation for Jayco Jay Flight
    Hey Lisa, we can definitely help. The trick to picking out a weight distribution system is to find a system that has a tongue weight range that your trailer's loaded tongue weight falls right into the middle of. So an Equal-i-zer system like the part # EQ37040ET would work great based on what you mentioned as it has a tongue weight range of up to 400 lbs. The Equalizer brand of WD systems is widely regarded as the best around with also the best sway control so this will work great for you.
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  • Weight Distribution Recommendation for 2011 KZ Hybrid Camper
    Hey Sal, I have just what you are looking for with the Reese Pro Bar part # RE34FR. This is a much lower cost option for a weight distribution system that will work great for you. It has sway control built into the system as well. Would this fit your budget better?
    view full answer...
  • Can 2023 Ford Maverick Use Weight Distribution Hitch
    Hi Brandon; are you towing near the max capacity of your Maverick? The information you saw is correct. Most unibody vehicles do not allow the use of a weight distribution hitch (WDH) but there are some exceptions. The answer can typically be found in the owner's manual. I don't see anything specifically listed in the manual online saying it can't be used but I recommend double checking yours to be sure. It might also be a good idea to double check with the dealer. Assuming you find the...
    view full answer...
  • Trailer Hitch and Tow Capacity of 2018 Lexus RX 350
    I Googled the owner's manual for a 2018 Lexus RX 350 and it said the maximum towing capacity was 3,500 lbs, and the Curt Trailer Hitch Receiver # C13272 has a 4,000 lb towing capacity so you will not have any problems using this hitch for towing less than the 3,000 lbs you mentioned. That said, we do recommend verifying all towing capacity information with vehicle manufacturers as they have the final say on these matters.
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  • Hitch Ball for Equal-i-zer Weight Distribution System
    Equal-i-zer weight distribution system # EQ37040ET, which is the same as the product you referenced does not require a 2-5/16" hitch ball; I took a look at the Equal-i-zer site and could not find a reference to that. However, if you need a 2-5/16" ball then the right one would be the 2-5/16" Hitch Ball for Equal-i-zer Weight Distribution Systems # EQ91-00-6100. It is also recommended you use Thin Walled Socket for Equal-i-zer Hitches # EQ70-00-4800 to make installation of this ball a little...
    view full answer...
  • Choosing Between Equal-i-zer and Curt Weight Distribution Hitch
    Hey Mark, welcome back! This is very much a case of "you get what you pay for." The Curt TruTrack 2P # C95MJ you looked at is a good option if you tow your trailer a short distance once or twice a year. If you tow with any frequency and you really want to keep everything nice and level while reducing sway the Equal-i-zer is definitely the way to go. They have been in the weight distribution business for over 75 years and they're considered one of the best out there. Do you know your tongue...
    view full answer...
  • Solution for Rear Sag on 2022 GMC Yukon Towing 6,000 lb Travel Trailer
    Hi Jason; it looks like your 2022 Yukon towing capacity is 7,500-7,900 lbs so I'm not surprised you're getting that rear sag. The best solution is going to be a weight distribution hitch. This will keep you level and also help reduce trailer sway for a much improved towing experience. I see you looked at some suspension enhancement but your only option is the # CSS-1168F which fits a 2WD and is only for the front axle which doesn't help anything. To choose the right weight distribution...
    view full answer...
  • Recommended Weight Distribution Hitch for a 400 lbs Tongue Weight Trailer
    Hey Mike, welcome back and congrats on the new Jeep! The Equal-i-zer Weight Distribution System w/ 4-Point Sway Control item # EQ37040ET, you purchased awhile back is going to work just fine so long as your tongue weight doesn't get over 400 lbs. If you get over that amount once you're fully loaded and you don't feel like the system is helping you, you'll want to upgrade to the 600 lbs TW item # EQ90-00-0600 or item # EQ90-00-0601 and reuse your current shank. This is the next size up...
    view full answer...
  • Wanting To Get Actual Weight Of Weight Distribution Hitches
    Hey Taylor, sure thing! Here are the weights for each of those: - Reese Pro Round Bar Weight Distribution w/ Sway Control - 6,000 lbs GTW, 600 lbs TW # RE34FR - 103 lbs - Fastway e2 Weight Distribution w/ Sway Control - Trunnion - 4,500 lbs GTW, 450 lbs TW # FA92-00-0450 - 101 lbs - Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 4,000 lbs GTW, 400 lbs TW # EQ37040ET - 98 lbs - Blue Ox SwayPro Weight Distribution w/ Sway Control for 2" Hitch - 3.5K GTW, 350 lbs TW #...
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  • Recommended Transmission Cooler for 2008 Honda Ridgeline
    For your 2008 Honda Ridgeline, a transmission cooler will be a wise choice. It will prolong the life of your transmission and improve its overall performance. For your Ridgeline, I recommend the Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class III - Efficient, # D13503. This is a plate-fin cooler that allows for heat distribution and increased air flow to cool your fluid. It is specifically designed for vehicles with late-model, electronic overdrive transmissions....
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  • What Friction Pads will Work with My Reese 350 Mini Weight Distribution Hitch?
    Hello Danny, I really wish I had a better answer for you, but there are not any other pads that are going to be compatible with your Reese 350 Mini Weight Distribution Kit, they would need to be custom made usually using brake lining material or rubberized friction pads used in industrial machinery. We recommend going with a new system, the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control - 4,000 lbs GTW, 400 lbs TW # EQ37040ET is an excellent system, and you will not need...
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  • Will Curt Friction Sway Control Work Without Weight Distribution System?
    The Curt Friction Sway Control, # 17200, can be used without a weight distribution system like you mentioned by using the Reese Sway-Control Bracket you referenced, # RP26003. This system helps to fight trailer sway, but only after it begins by adding friction to the sliding bar to stabilize your trailer. This is a reactive system that will help with your trailer sway after it has started and has adjustable tension. This is a great cost effective option for limited sway. It does however...
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  • Recommended Weight Distribution System for a Minivan Pulling a Pop Up Camper
    I took a look online, the Curt Trailer Hitch item # C13105 you have on your Sienna is rated to be used with a weight distribution system. The best one for your 2,100 lbs pop up camper is going to be the Equal-i-zer Weight Distribution System item # EQ37040ET. This system works with trailers that have up to a 400 lbs tongue weight. The Equal-i-zer system includes a 2" shank that can be inverted and used in the rise position. This will help to address your ground clearance concerns with...
    view full answer...
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  • Recommended Rear Suspension Enhancement And Weight Distribution Hitch For 2010 Ford Ranger
    I definitely recommend going with the bump stop jounce-style springs that you are referring to as these require no maintenance and are very easy to install. They drastically reduce rear sag and also help with the overall handling of your truck. Your two options for your 2010 Ford Ranger are the SumoSprings Solo Custom Helper Springs - Rear Axle # SSR-113-40 and the Timbren Rear Suspension Enhancement System # TFRR050A. The SumoSprings have a weight capacity of 1,000lbs which would be good...
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  • Weight Distribution Hitch for 2024 Toyota RAV4 Towing Travel Trailer
    Hi Rick; the right weight distribution hitch will depend on the loaded tongue weight of your setup. The best way to find this is with a tongue weight scale like the # BTBRV44FR. Once you have this measurement you can find a system with an appropriate tongue weight range. Tongue weight is typically 10-15% of the loaded trailer weight so you can also use that to get an estimate. If you look up the specs of your trailer there will be a dry hitch weight, which is the unloaded tongue weight,...
    view full answer...
  • Weight Distribution System to Provide Best Possible Ground Clearance
    With weight distribution/sway control (WD/SC) systems the best ground clearance generally comes from trunnion-style setups like the Equal-i-zer # EQ37040ET that you referenced. These systems' bars do connect to the side of the head assembly, rather than up into its bottom surface like round-bar systems such as Pro Series # PS49901. This is where their better clearance comes from. We do not offer any system whose bars attach to the top surface of the head assembly although one of my associates...
    view full answer...
  • Best Sway Control System for a Pontoon Boat Trailer with Surge Brakes
    I do have an option for you but the Curt Friction Sway Control Bar part # 17200 that you referenced cannot be used on trailers with surge brakes. Instead, you would want to look into a weight distribution system with integrated sway control. This will be the only option we have for you that will allow you to use sway control on your trailer. As long as the weight distribution system does not use chain style spring bars then it will not affect the action of the surge brakes. In order to...
    view full answer...
  • Weight Distribution Hitch Recommendation for a 2021 NuCamp T@B 320s Boondock
    We definitely recommend using a weight distribution hitch for towing your trailer on your Sante Fe XL. Not only does a weight distribution provide you the comfort and peace of mind of an easier drive, it also helps ease the stress put on the suspension. However, before even considering a weight distribution hitch, you need to have a compatible hitch receiver that can be used with a weight distribution system. That is commonly found on the sticker on the hitch itself or the hitch instructional...
    view full answer...
    Image 1 for
  • Can You Back Up and Turn With Weight Distribution System Installed on Trailer
    With weight distribution systems like the Equal-I-Zer # EQ37040ET that you referenced you can back up and turn slightly but you basically can't jackknife the trailer as it will brake things. If you can imagine how tight of a turn you can get into while going forward that would be the same sharpness you would be limited too when backing up. If for some reason you have to go super sharp you would need to disconnect the sway bars and you can go as tight as you want.
    view full answer...
  • Weight Distribution System Recommendation For A 2016 Nissan Frontier
    For your 2016 Nissan Frontier, we have the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control # EQ37040ET. This is the smallest WDS we offer with a max tongue weight of 400lbs, and a max gross towing weight of 4,000lbs. This WDS fits 2" x 2" trailer hitch receivers rated for use of a WDS like # e98869. Additionally, you'll want to properly measure your tongue weight to ensure that hitch will work for you. Your tongue weight is the dry weight so when loaded may be over the...
    view full answer...
  • How to Prevent Truck From Sagging When Towing
    The best way to prevent a vehicle like your 2018 Toyota Tacoma from sagging is with the use of a weight distribution system. What happens when you tow is that weight gets transferred to the rear axle of your tow vehicle which causes it to sag. A weight distribution system will transfer that weight to each of the axles on your trailer and tow vehicle, stopping it from sagging and greatly enhancing your towing experience due to improved handling from your tow vehicle and the sway control...
    view full answer...
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