1. Trailer Leaf Spring Suspension
  2. SuperSprings Intl
  3. Leaf Spring Enhancement System
  4. Springs
  5. 3000 lbs
  6. 4000 lbs
  7. 5000 lbs
SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung

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

Item # TSS-106-40
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Trailer Leaf Spring Suspension
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Lowest Prices for the best trailer leaf spring suspension from SuperSprings Intl. SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung part number TSS-106-40 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (9)
  • Q & A (40)
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  • Why etrailer?

SuperSprings Intl Trailer Leaf Spring Suspension - TSS-106-40

  • Leaf Spring Enhancement System
  • Springs
  • 3000 lbs
  • 4000 lbs
  • 5000 lbs
  • Single Axle
  • Jounce Springs
  • SuperSprings Intl


  • Improves suspension, handling and safety
  • Progressive spring rate
    • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added
      • Increases stability, providing great performance while hauling heavy loads
      • Raises trailer ride height
  • Works independently side-to-side
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
    • Works to eliminate trailer sway
  • Acts as shock absorbers, taking the brunt of bumps and rough roads
    • Reduces load on leaf spring assembly
    • Extends the life of your trailer's suspension
  • Application: 3,000-lb to 5,000-lb single, underslung axle - springs sit under axle
    • For tandem axle applications, use 2 kits
    • Designed to work with a suspension system that is in good working order
  • 2 Jounce-style springs, line relocation bracket, mounting brackets and hardware are included
    • Maintenance-free - no tubing to run or air pressure to monitor like with air springs
    • Simple, no-drill installation
  • Capacity: 500 lbs at 50 percent compression
    • Do not exceed the trailer's weight-carrying capacity
  • Spring dimensions: 4" tall x 4" diameter
    • Compresses up to 80 percent of original height with full memory rebound
  • Patented micro-cellular urethane construction
  • U-bolt dimensions:
    • 1-1/2" Tall x 2-1/2" wide
    • 4-7/8" Tall x 3" wide
  • Fits 3-leaf trailer leafsprings
  • Limited Lifetime warranty
  • 30-Day satisfaction guarantee
  • Made in the USA

TSS-106-40 SumoSprings Trailer Helper Springs with Line Relocation Bracket - Single Axle - 3K to 5K - Underslung

Installation Details TSS-106-40 Installation instructions




Customer Reviews

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung - TSS-106-40

Average Customer Rating:  5.0 out of 5 stars   (9 Customer Reviews)


- TSS-106-40
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My SumoSprings definitely help with trailer sway on windy days. They were not hard for me to install with standard tools.



- TSS-106-40
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Perfect fit for trailer with axle over leaf springs



- TSS-106-40
by:

Got the wrong product, BUT I called and explained to Jeoff. I didn’t know if I explained it the right or the person didn’t hear me correctly? It really doesn’t matter, I just needed the right part. They are sending me a return label. Then I ordered the correct part. I’ve ordered from eTrailer before and been very happy. I very happy today, all is well



- TSS-106-40
by:

Already installed on my Toy Hauler trailer! Super happy with them! Thank you!



- TSS-106-40
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Only one on market



- TSS-106-40
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- TSS-106-40
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- TSS-106-40
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9
9

Ask the Experts about this SuperSprings Intl Trailer Leaf Spring Suspension

  • Will the SumoSprings TSS-106-40 Fit a Trailer with 5-1/2 Inches Between the Leaf Spring and Frame
    The SumoSprings Trailer Helper Springs part # TSS-106-40 will fit your trailer even though you only have 5-1/2" of space between the top of the leaf spring stack and the bottom of the trailer frame. The overall height of the kit 7-3/4" (Spring 5" + Bracket 2-3/4") will exceed your measurements but what you can do is take a bread knife and cut one or two of the coils off the SumoSprings until they will fit under the frame. SuperSprings came to our facility for training and said that there...
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  • Will SumoSprings Trailer Helper Springs Help With Trailer Bottoming Out
    Instead of replacing your leaf springs, the best solution for the issue you are having bottoming out is the SumoSprings Trailer Helper Springs # TSS-106-40. The reason is these will sit on the leaf spring and take the brunt of the capacity and cushion the ride, but you do need to have 7-1/2 inches of space from the leaf spring to the trailer frame. Otherwise, if you don't have that amount of space the best option would be to mount the leaf springs on top of the axle, and for that...
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  • How To Fix 2019 Vanleigh Vilano 5th Wheel Trailer Leaning To One Side
    It is indeed sometimes common for a travel trailer to lean more to one side even when new as that side usually has all of the heavier appliances. This is not really any sort of warranty issue with the leaf springs but I do have an option that should help mitigate the effect of the trailer leaning to one side and that's with the SumoSprings Trailer Helper Springs part # TSS-106-40 for underslung and part # TSS-107-40 for overslung axles. This may not get you back to level but as the springs...
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  • SumoSprings Trailer Helper Springs Recommendation for OverSlung Trailer Axle
    Drop axles don't drop the distance between the trailer frame and axle as basically the drop is after the suspension and between the spindle. So the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-106-40 would install just fine on a drop axle. But sounds like you have an overslung axle based on the distance between your leaf spring and trailer frame. So for that you'd instead want the part # TSS-107-40.
    view full answer...
  • Raising the Height of a 2019 Forest River Viking 17BH Travel Trailer for Driveway Clearance
    Without any spacers at all the SumoSprings Trailer Helper Springs # TSS-106-40 actually sit 7-1/2" tall so there will need to be a significant amount of compression for your suspension to sit properly. I do have a better solution for the problem you are running into with your 2019 Forest River Viking 17BH. I recommend using the Dexter Trailer Springs Over-Under Conversion Kit # K71-384-00 which changes your leaf spring suspension to overslung so that your leaf springs sit on top of...
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  • Which Side Of the Axle Do the SumoSprings Trailer Helper Springs Install
    The SumoSprings Trailer Helper Springs part # TSS-106-40 per the instructions will be installed on the side of the axle closest to the end of the leaf spring that is connected to a shackle or center link.
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  • Recommended Sumo Springs For Small Trailer With 3500 Lb Axle With Bouncy Suspension
    It sounds like your springs are more than likely maxed out if they have a 1750 lbs capacity and your trailer is 3400 lbs loaded. Getting in the trailer and moving around is adding extra weight to the springs as well. If the leaf springs sit below the axle then you can use SumoSprings Trailer Helper Springs w/ Line Relocation Bracket part # TSS-106-40 to support the suspension and increase the stability of the leaf springs to help them last longer. Please keep in mind these are designed...
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  • Recommended Suspension Enhancement for Trailer with 2-1/2 Inch Wide Leaf Springs
    I have a solution for you but because of the width of your leaf springs, the SuperSprings # TSS-106-40 are not going to be a workable solution for you since they do not make a SuperSpring to work with that size leaf spring. I would instead recommend using the Timbren Trailer Suspension Enhancement System Medium-Duty Trailers # TTRA1032 which will provide you with support for up to 7000-lbs of cargo on your single axle trailer and because the bolt directly to the trailer frame and sit above...
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  • Will SumoSprings Trailer Helper Springs # TSS-106-40 Work Well on Trailer with 2,990 GVWR
    The SumoSprings Trailer Helper Springs # TSS-106-40 were intended for use on trailers with weight capacities between 3k and 5k. You are REALLY close to the range of this kit so it would work great still for you since you are 10 lbs under the ideal range.
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  • How to Prevent Trailer Axle from Hitting the Frame
    Installing a 4,000 lb capacity leaf spring on a trailer with a 3,500 lb capacity axle will make the suspension stiffer which could then in turn minimize the risk of the axle contacting the frame. However, this is not what I recommend to fix your problem. Instead, I recommend using the SumoSprings Trailer Helper Springs part # TSS-106-40 which will provide you with a rubber bumper between the suspension and frame as you can see in the attached photo. They will not produce a continuous rough...
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  • What Side of Axle Does SumoSprings Trailer Helper Springs # TSS-106-40 Install On
    You'd want to install the SumoSprings Trailer Helper Springs # TSS-106-40 on the front side of your axle.
    view full answer...
  • Recommended Jounce Springs for Trailer with 7K Axles
    The SumoSprings Trailer Helper Springs part # TSS-106-40 which are designed for underslung springs I can confirm will work with 7,000 lb axles. They are our best option for trailer jounce springs so this is what I recommend. They do a great job of providing additional support as needed as well as helping to reduce body roll and sway.
    view full answer...
  • 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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  • 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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  • 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 Suspension to Dampen Road Shock
    Based on what you are saying and your photos, it apprears you have springs that are double eye springs. The springs will need to be based on the load of your trailer. The axle capacity may be difficult to know as you said it appears to be custom. I recommend determining the full capacity of the trailer including the wood you will be adding to it. Once you know that complete weight, then I can help you determine the best springs for your total capacity. Overbuilt isn't bad in...
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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...
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  • Comparing SumoSprings Helper Springs And Roadmaster Comfort Ride Shocks For 5th Wheel Trailer
    I would be happy to recommend a suspension enhancement option for your 14000lb GVWR 5th wheel trailer. Starting with the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-106-40 which act as shock absorbers taking the brunt of bumps and bouncing on rough roads, and offer 500lbs of support when 50% compressed to prolong the life of your leaf springs and suspension components. This option is great for being maintenance free, but will only fit trails with 3-leaf leaf springs,...
    view full answer...
  • Correct SumoSprings Solo Custom Helper Springs for a Travel Trailer
    I do have an option for you but if you're looking to install SumoSprings on a travel trailer you'll be looking at either the SumoSprings Trailer Helper Springs part # TSS-107-40 for overslung axles or part # TSS-106-40 for underslung axles. They have a 3,000 lb to 5,000 lb capacity. These systems both install by attaching to the leaf springs.
    view full answer...
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  • How to Determine What SumoSprings Leaf Spring Enhancement Will Work
    In order to determine the correct SumoSprings Leaf Spring Enhancement System for your trailer, you need to need the weight capacity of the axles and if you have an overslung or underslung axle (which I'll explain). Based on your 2017 Montana's weight, both available kits have the right capacity, so all you need to do is find out if your Montanta has an overslung (springs sit over axle) or underslung axle (springs sit under axle). All this means is the position of the leaf springs...
    view full answer...
  • How to Determine Correct Replacement Springs for a 2019 Keystone Fuzion 424 Toy Hauler with 7K Axles
    I was able to find that your 2019 Keystone Fuzion 424 Toy Hauler has 7K axles and while we do have leaf springs for 7K axles, you'll need to take some measurements of your leaf springs to ensure that you get leaf springs that are the correct length for your application. Height can be a factor as well unless you are swapping out all of your leaf springs on all of your axles. If you are referring to suspension enhancement we have that too. Unfortunately we don't have a way to look up exactly...
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  • SumoSprings Helper Springs for 5th Wheel Trailer
    The SumoSprings Solo Custom Helper Springs # SSR-210-47 referenced in your question are actually jounce-style springs, not air bags, so they do not feature a valve that could be used to fill them with air. These are maintenance free springs that don't require any adjustments or attention after the initial install. These particular springs are designed specifically for certain model years of the GMC Canyon and Nissan NV or Xterra. Installing these on your 5th wheel trailer would likely...
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  • Upgraded Tires With Higher Load Range for 2019 Forest River Wolf Pup
    In order to achieve a higher load capacity you will indeed need to upgrade to a larger size tire, the Castle Rock ST205/75R15 Radial Trailer Tire w/ 15" Smoke PVD Wheel part # 274-000033 is a good option for this and will provide you with a 4,300 lb total weight capacity. The wheels are an exact match for what you have now as well so you won't have to worry about changing the look of the trailer. The 5 on 4-1/2" bolt pattern is an industry standard and the overall dimensions are 27" diameter...
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  • How To Upgrade Leaf Springs And Add Shocks to a Coachmen Clipper 17FQ
    Yes, you can upgrade the leaf springs on a Coachmen Clipper 17FQ to a higher rated set just keep in mind the ride may be a bit stiffer. I have attached a list of our leaf spring options for you but if you can provide me with the unloaded eye to eye measurement I can then recommend a suitable replacement. The 4-Leaf Double-Eye Spring part # SP-218275 for example are rated for 2,500 lbs each and measure 25-1/4" eye to eye which is pretty standard. The Lippert Components Bolt-On Shock...
    view full answer...
  • Can Lippert Shocks be Installed on a Trailer Axle that is Mounted on Top of the Leaf Springs
    There isn't a different plate for use with axles mounted on top of the leaf spring stack for you to install shock kit # LC281281. But there are other suspension enhancement products available for trailers. For underslung axles rated for 3,000 to 5,000 pounds you can use SumoSprings # TSS-106-40.
    view full answer...
  • How Much Space Is Required for the Timbren Trailer Suspension Enhancement System TTRA1032
    I do have an option but the Timbren Trailer Suspension Enhancement System part # TTRA1032 requires 3" between the frame and axle/leaf springs so it won't work. I can't recommend you raise the frame from the axle to use these as the preload would not be correct. Instead, the SumoSprings Trailer Helper Springs part # TSS-107-40 or part # TSS-106-40 is what I recommend and you would actually lift the trailer frame from the axle to install these as they are designed to be installed with a preload.
    view full answer...
  • 2016 Coachmen Clipper BH17 Replacement Leaf Spring Suspension Enhancement
    It looks like the springs that you have are the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # SP-210275. These springs do not have a lot of curve built into them at 2-3/4" when relaxed from eylet to top of spring pack. There are some 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles # SP-051275 that would give you a higher curve at 4-1/4" from eyelet to top of spring pack. Please note that the axle on your camper is rated for 3500lbs so the higher capacity springs will not...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
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Installed by:
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