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SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung
SuperSprings Intl

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung

Part Number: TSS-107-40
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$267.99
Retail:$298.55
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Improves suspension, handling and safety. Progressive spring rate. Provides additional support as needed so you always have a smooth, comfortable ride. Great Prices for the best trailer suspension parts from SuperSprings Intl. SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung part number TSS-107-40 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Trailer Suspension Parts - TSS-107-40

Highlights

  • Improves suspension stability: Absorbs road shock and reduces body roll for smoother rides.
  • Progressive spring rate technology: Becomes more rigid with increased load for optimal support.
  • Easy installation with no drilling: Maintenance-free design without the need for air pressure.
  • Heavy-duty application: Suitable for single axle trailers rated between 3K to 5K.
  • Versatile across trailer types: Ideal for boats, campers, utility trailers, and more.
  • Made in the USA: High-quality construction with a limited lifetime warranty for peace of mind.

Features to know about

Smooths Out the Ride: Progressive Spring Rate

Tired of feeling every bump and sway when towing your trailer? SumoSprings Trailer Helper Springs use a progressive spring rate to adjust to the weight of your load. This means they become more rigid with heavier loads, offering extra support right when you need it, resulting in a smooth and stable ride without the hassle of adjustments.

Easy Installation, No Toolbox Needed: Simple, No-Drill Setup

Say goodbye to complex installations and specialized tools. The SumoSprings Trailer Helper Springs are designed for a straightforward, no-drill installation. Everything you need is in the box—two jounce-style springs, a line relocation bracket, mounting brackets, and hardware. Just elevate your trailer, slide them in, and you’re set!

Boost Your Trailer’s Longevity: Extends Suspension Life

Want to protect your trailer’s suspension from wear and tear? These helper springs relieve the load stress on your leaf springs, acting as shock absorbers over rough roads and bumps. This not only enhances your ride quality but also extends the life of your trailer’s suspension system, keeping everything in top shape with less maintenance.

Compensates for Off-Center Loads: Independent Side-to-Side Operation

Struggle with uneven loads? The SumoSprings work independently on each side of your trailer, which helps manage those off-center loads. This feature reduces body roll during tricky maneuvers and cuts down on trailer sway, providing a more balanced and controlled towing experience.

Handles Heavy Weights with Ease: Fits 3,000 to 5,000 lbs Axles

Whether you’re towing a boat trailer, camper, or utility trailer, SumoSprings are ready for the job. They are specifically designed to support single, overslung axles rated 3,000 to 5,000 lbs. Perfect for hauling heavy loads without the typical sagging and swaying—even when managing weight close to capacity.

Space Saver on Your Trailer: Compact Spring Dimensions

Don't compromise on valuable clearance. Each spring measures a compact 5 inches in height and 4 inches in diameter, compressing up to 70% of their original height but fully rebounding after with a memory feature. This ensures you maintain adequate spacing and clearance between your trailer's frame and spring plate, enabling a smooth journey on any road.

Specs

Application

  • Application: 3,000-lb to 5,000-lb single, overslung axle - springs sit over axle
  • For tandem axle applications, use 2 kits

Capacity

  • Capacity: 500 lbs at 50 percent compression
  • Do not exceed the trailer's weight-carrying capacity

Dimensions

  • Spring dimensions: 5" tall x 4" diameter
  • Compresses up to 70 percent of original height with full memory rebound
  • Required clearance between top of spring plate and bottom of trailer frame: 5-5/16" - 6-1/2"

Warranty and Guarantee

  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

Note

Does not work with spring plates wider than 4-1/4".

TSS-107-40 SumoSprings 3K-5K Trailer Helper Springs w/Bracket-Overslung

Replaces SuperSprings TSS-104-40

Installation Details TSS-107-40 Installation instructions



Customer Satisfaction Score:

Ratings & Reviews

4.7

274 reviews
Improves suspension, handling and safety. Progressive spring rate. Provides additional support as needed so you always have a smooth, comfortable ride.

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See what our Experts say about this SuperSprings Intl Trailer Suspension Parts

  • Will Over/Under Kit Work With MORryde X-Factor Crossmember
    Hey Peyton, Yes, those things are all indeed compatible as the crossmember won't come into contact with the over/under kit. As for the correct kit, that depends on the size of your Keystone Cougar's axles. For 2-3/8" diameter axles use the Dexter Trailer Springs Over-Under Conversion Kit # K71-384-00; for 3" diameter axles use the Dexter Trailer Springs Over-Under Conversion Kit # K71-385-00. Then you can use the SumoSprings but you need to have between 5-5/16" and 6-1/2" of clearance...
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  • Can 2024 Toyota Highlander Limited Use Weight Distribution Hitch
    Hi Earle; in general, a weight distribution hitch is a no go for unibody vehicles. However, that is not an absolute. I don't see anything specifically calling out weight distribution in the owner's manual so it is possible if the manufacturer says it is ok. I would reach out to a local dealer to see what they have to say about it. Assuming it is allowed, you will need a hitch that is compatible with weight distribution which would be the Curt # C45CR. For the weight distribution hitch...
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  • SumoSprings for KZ Sportsmen Dual Axle Travel Trailer
    The SumoSprings Trailer Helper Springs # TSS-107-40 are designed for single axle trailer applications, so for your tandem axle travel trailer, you'll just need two of these kits. These SumoSprings will fit your 2016 KZ Sportmen travel trailer as long as each of the axles is rated between 3,000 lbs and 5,000 lbs and they are overslung, where the springs sit on top of the axle. If your springs sit below the axle, which is the more common setup, you'll want to use two of part # TSS-106-40,...
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  • How to Reduce Ford F-250 Jiggling From Grand Design Travel Trailer
    There are a few different things you can do to help with this. It would also be helpful to know what kind of jiggling you're experiencing. Does it just feel bouncy and rough? Is it side to side motion? If your travel trailer weight is more than 50% of your trucks GVWR then it would be a good idea to use a weight distribution hitch which will level you out and reduce sway. If it is more like a rough ride then you could try an upgraded equalizer, shocks, or adding something like SumoSprings...
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  • What Causes Trailer Leaf Springs To Break Continuously
    Yes, leaf springs must be replaced in pairs which is why one side left go and then the other shortly after. In regards to the stent you get on a full set of leaf springs, there are really a ton of variables present here so it is hard to predict. However, if you are a full-timer then odds are your trailer is going to be subjected to harder conditions and most likely more weight than the average trailer therefore your suspension components will wear faster. I have attached our leaf spring...
    view full answer...
  • Which End of SumoSprings Kit to Trim Down TSS-107-40
    Hey Tom, if you are going to trim down the SumoSprings kit part # TSS-107-40 you would want to trim off the top of the spring.
    view full answer...
  • Correct SumoSprings Kit for a 2024 Grand Design Imagine XLS 22MLE
    Hey Frank, thanks for reaching out! Yes, when the axle is located under the leaf springs that is considered "overslung" so the SumoSprings Trailer Helper Springs # TSS-107-40 are exactly what you need. Be sure to get one kit for each axle! Just curious what led you to wanting to add a suspension enhancement like this? Are you wanting a smoother ride for your trailer?
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  • SumoSprings for Jayco Jay Flight SLX-7 183RB Baja & How to Determine Solar Power Needed
    Based on my research, your 2020 Jayco Jay Flight SLX-7 183RB Baja has a single 3,500 lb axle which is overslung - meaning the leaf springs sit over the axle. Knowing that, the correct SumoSprings for your trailer are the SumoSprings Trailer Helper Springs # TSS-107-40. These will do a great job of helping stabilize your trailer and reduce the amount of body roll that can occur. I have added links to the instructions as well as video reviews for you to check out as well of the SumoSprings...
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  • Warranty Length and Improvements that Lippert Center Point System Offers to Trailer Installed On
    The Lippert Components Center Point by Trailair Air-Ride Suspension Upgrade # LC1565391 that you bought has a 90 day warranty. This system has only one inflation point which equalizes the pressure between both sides of the trailer so it does not have a way to have more pressure in one side than the other. This system is designed to greatly improve the suspension performance and ride quality of the trailer you install it on but does not necessarily provide additional support although it...
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  • How Can I Reduce The Bouncing On My 12 Foot V-Nose Cargo Trailer
    You can eliminate the bounce in your trailer and smooth your ride with the addition of Sumo Springs. You will have two options, depending on how your leaf springs are mounted on your trailer. If your leaf springs are underslung, meaning they are under the axle of your trailer, I recommend the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung, part # TSS-106-40. If your leaf springs are overslung, meaning they are over the axle of your...
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  • Can the Leaf Springs Be Upgraded On a Lippert 3,500 Lb Axle
    It is possible to upgrade the leaf springs on a trailer to a higher rated set but I do not recommend this as it can create a rough ride. The better option would be to install the SumoSprings Trailer Helper Springs part # TSS-107-40 for overslung or part # TSS-106-40 for underslung axles. These will offer both additional support without decreasing the ride quality. If you would still like for me to recommend a set of upgraded leaf springs, I'd need to know the unloaded length from eye to eye.
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  • Recommended Trailer SumoSprings For A 2014 Keystone Cougar 19RBLTravel Trailer
    Hey Clark, Trailer SumoSprings are based on axle capacity and the orientation of the leaf springs. You'll want to match the capacity of the spring to the axle's capacity and also take a look to see whether your leaf springs sit above or below the axles. If they sit above then you have an overslung suspension, if they sit below you have an underslung suspension. Overslung: 3k - 5k # TSS-107-40 Underslung: 3k - 5k # TSS-106-40 Most likely you have an underslung suspension since it's...
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  • Can Heavier Duty Leaf Springs Be Installed on a 2021 Coachmen Catalina Travel Trailer
    Hi James, You can swap out the leaf springs to help reduce wear but you'll most likely notice a little bit stiffer of a ride, but not enough to really matter. To find the correct replacement you'll first need to measure the leaf spring so that we can find a compatible replacement. I've attached two diagrams below to show you how measure your leaf springs. Once you have the measurements let me know and I'd be happy to look for a replacement. Another option to help support your suspension...
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  • Replacement Pin Box Option For A Lippert Turning Point Rotating Pin Box
    The Lippert Turning Point has a specific bolt pattern that only has one replacement so far, the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY48GR. This is a gooseneck adapter though so you'd have to switch out the hitch for a gooseneck ball for this to work. The torsion head will help reduce road shock and chucking transferred to your truck so it is worth considering, but you'll also be moving your pivot point back to the truck so you could run into clearance issues if...
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  • Recommended SumoSprings For A 2016 Forest River Wildwood 28DBUD Travel Trailer
    Hey Lance, To determine the correct SumoSprings for your 2016 Forest River Wildwood 28DBUD we'll need to first see if your leaf springs sit above or below the axle and we'll need to know the axle capacity. If your springs sit above the axle then you have overslung suspension and if they sit below the axle you have an underslung suspension. For the capacity you likely have a 3,500-4,400lb axles but you can verify by looking at the axle for the a sticker that lists the capacity. I've separated...
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  • SumoSpring For A 2022 Grand Design 22RBE With Dual 3.5K Overslung Axles
    For your 2022 Grand Design 22RBE with dual 3,500 lb overslung dexter axles the correct SumoSpring kit is part # TSS-107-40. Since your trailer is a tandem axle you will need two of these kits. These are made specifically for overslung axles rated between 3,000 and 5,0000 lbs, so it will work perfectly for your camper. You can expect to see a much smoother ride with less jarring or chucking. SumoSprings will help to reduce sway and body roll. They may also raise the trailers ride height...
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  • 500 lbs Capacity for the SumoSprings Trailer Helper Springs for 3,000 lbs -5,000 lbs Axles
    Nope it's correct. As a pair they are rated at 500 lbs at 50% on the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket item # TSS-107-40. This kit is designed for 3,000 lbs - 5,000 lbs overslung axles with springs sitting above the axle. They do not have a 3,000 lbs - 5,000 lbs capacity.
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  • Shock Absorbing Equalizers Or SumoSprings For 2021 Grand Design Imagine 2400BH
    There would be no issues with using the SumoSprings like the # TSS-107-40 with the Road Armor or MORryde Upgraded equalizers. With that being said, I would upgrade your equalizers first, and I think you will find that they will provide the suspension upgrades you are looking for without needing additional components. To determine the correct replacement equalizers, you will need to know how long your current equalizers are between the horizontal mounting holes to to keep your suspension...
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  • Will the SumoSprings Trailer Helper Springs Fit a 2020 Keystone Cougar?
    The SumoSprings Trailer Helper Springs part # TSS-107-40 are compatible with practically any trailer that has a 3K to 5K overslung axle or in other words the leaf springs are mounted on top of the axle. If you have an underslung axle in which the leaf springs are mounted below the axle then you need the SumoSprings Trailer Helper Springs part # TSS-106-40 which is also designed for 3K to 5K capacity axles. I spoke with SuperSprings and they informed me that there isn't a minimum space...
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  • Will SumoSprings Trailer Helper Springs TSS-107-40 Help Bouncing Of 2017 Forest River Wolf Pup?
    As long as your 2017 Forest River Wolf Pup 17' Toy Hauler has a overslung axle (Leaf springs mounted on top of the axle) then the SumoSprings Trailer Helper Springs # TSS-107-40 you were looking at would be a perfect option for softening the unloaded ride of your trailer. This kit will act as a shock absorber to absorb road shock and not pass that through your trailers suspension, but will also help to reduce body roll and sway of the trailer. I included a video of the # TSS-107-40 for...
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  • How To Fix Uneven Ride On 6x12 Single Axle Enclosed Trailer
    Hello Kenneth, thanks for reaching out. There are a few ways to address the issue you are having with your enclosed trailer. The first and easiest way to fix the issue is to simply add more weight to the light side of the trailer. Really anything to weigh down one side a bit will help. I have seen people do this with sand bags, cinder blocks or really any heavy material. This way you can fix the uneven ride without having to modify the trailer or replace any parts. Another option is to...
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  • Sidewinder Pin Box for 2022 Wildwood Heritage Glen 5th Wheel
    The ST200 turret for the # 5AS16K has been discontinued. You may be able to find it still but I wasn't able to when I ran a quick search. At this time, the only Sidewinder we offer that fits the 1621 is the # RP34FR. Also, you aren't hearing from Reese because they're owned by First Brands now. Ever since this change the wait times on the phone are extremely long and many of their parts are gone or on indefinite backorder. The # RP34FR will help with clearance but it won't do anything...
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  • Solution to Help Keep Tires From Rubbing on 2019 Keystone Cougar on Rough Roads
    Hey Brian, thanks for reaching out! The measurements you have are similar to the 4-Leaf Double-Eye Spring for 4,400-lb Trailer Axles # DX95CR so it sounds like your leaf springs aren't flattening out as of yet. If you drive on some pretty rough roads with the trailer close to max GVWR then that could definitely be why you're seeing tire marks. I recommend checking out the SumoSprings Jounce Springs for trailers to help soften the bounce from those roads. You'll just need to choose the...
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  • Will SumoSprings Improve Ride Quality On 2021 Grand Design Imagine 2400BH With Cushioned Equalizers?
    I do recommend also adding the SumoSprings Trailer Helper Springs # TSS-107-40 on your 2021 Grand Design Imagine 2400BH. These will help to absorb additional road shock the MORryde Shock Absorbing Suspension Equalizers # MR27ZR might not. They also provide stability to the suspension which helps to reduce bouncing and reduce body roll. You will need to ensure you have 5-5/16" to 6-1/2" between the trailer frame and the leaf spring u-bolt plate for the SumoSprings to fit properly. Be sure...
    view full answer...


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