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  1. Trailer Leaf Spring Suspension
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  3. Leaf Spring Enhancement System
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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

Our Price: $299.99
Trailer Leaf Spring Suspension
Shipping Weight: 8 lbs
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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 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 1-800-940-8924 for expert service.
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  • Reviews (35)
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SuperSprings Intl Trailer Leaf Spring Suspension

  • Leaf Spring Enhancement System
  • Boat Trailer
  • Camper
  • Car Hauler
  • Snowmobile Trailer
  • Utility Trailer
  • 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.


Features:

  • Improves suspension, handling and safety
  • 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
  • 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
  • Made in the USA


Specs:

  • Application: 3,000-lb to 5,000-lb single, underslung axle - springs sit under axle
    • For tandem axle applications, use 2 kits
  • Fits 1-3/4" wide spring packs
  • 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 70 percent of original height with full memory rebound
  • Required clearance between top of spring plate and bottom of trailer frame: 6" - 8-5/8"
  • Limited lifetime warranty
  • 30-Day satisfaction guarantee


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

Item # TSS-106-40

Installation Details TSS-106-40 Installation instructions



Customer Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (35 Customer Reviews)

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

by:

Well-manufactured and designed product. I'm 74 and it took me about two hours to install on my travel trailer, but there were no problems and it seemed to fit perfectly and do the job I wanted it to do, which was support the leaf springs. Shipping was fast and free, and the follow-up is clear and honest. Great job, etrailer!!

Garth

12/4/2023

Great! No problems whatsoever. If anything these helper springs aided me in avoiding future pothole problems.



by:

My order arrived quickly and correct. I appreciate the tracking emailed to me. The helpers went on easily and just like the video. My only modification was to remove the band on the rear spring. (A five minute task) The RV sits about 1 1/2 inches taller. I prefer this to flipping the axle in order to maintain a low center of gravity. In the picture, the springs actually are vertical when the RV is put back on the ground.

Glenn E.

8/4/2022

One year later, no problems. Everything has worked well. The RV is more stable on the road. Great product, I would buy again without hesitation.



by:

Worked really well, definitely smoothed out the ride. We are finding significantly less chaos with the equipment in the trailer.

The only complaint I would have is trying to use the Sumo Spring for very small enclosed trailers. The STEEL MOUNT was too tall, to meet the relaxed position height, so we cut 1" out of the mount and re-welded together, and repainted. But other than the additional modification it worked great.

Diesel S.

4/13/2023

Overall its a good product! There is certainly only so much you can do with a single axle trailer, its going to be a rough ride. But the Sumo Springs definitely smooth it out. We have had significantly less damaged items in the trailer after installing them.



by:

I installed these on my 2022 Forest River Wolf Pup 16FQ Black Label camper. These springs tremendously reduce swaying and augments the leaf springs to make the camper pull much more smoothly.. Highly recommended!



by:

Easy install on my 2012 Wolf Pup Travel Trailer. I am yet to take it out but the squeak from the leaf springs is gone and it feels much more stable walking around inside. I can’t wait to get it in the road! I gained about 1.5 inches of wheel well space to fender as noted by some other reviewers but my camper is near empty so loaded it will be perfect and I don’t mind having a bit more clearance as I have a low trailer to begin with. No spacers we’re needed for my camper. I would say also I have about .75-1 inch preload vs instructions which say recommended range is 1/4-.5 inches… again I felt OK installing and have used sumo springs in the past with good results.



by:

I just installed the SumoSprings on a KZ Sportsmen Classic 160QB and it makes a big difference in stability. I also ordered Part number TSS-CTP (contact plate) from SumoSprings since the travel trailer frame is slightly offset and the Sumospring makes only 60% contact. Always great service and useful info from etrailer.



by:

They were easy to install and did everything they advertised. They smoothed out the ride, stabilized the load on the trailer even when the weight was off center. Well worth the money



by:

A breeze to install, excellent product.Significanly reduced bounce inside the trailer while in tow running.



by:

The Sumo springs for our dual axle 25' camper made it more stable esp on windy days and on bad roads. The stuff didn't get thrown from the cabinets.
Installation was easy after taking off the wheels.



by:

Great product, using on a single axle camper with a gross of about 4,800. Had an OEM spring snap before so wanted to ensure the new springs had some assistance for future wear prevention. Trailer is more sturdy to tow for sure. Not a world of difference, but definitely noticeable. Mostly on turns and when larger trucks pass, I can feel the camper shift and sway less, a very welcome feeling. Also, feels slightly sturdy when in trailer. Lastly, it sits a hair higher when fully loaded. Overall, a product I am very pleased with. Price seems a little high for the product you receive (material wise). But, it is a low cost investment for the future.



by:

Worked beautifully on homemade trailer with axle/leaf springs from old Rambler station wagon that easily bottomed out. Needed to do a wacky installation with added spacer, so probably invalidated warranty, but still works like a charm.



by:

Easy to install. Fit perfect. Waiting to see how they perform.



by:

Easy install and they significantly reduces the side to side roll on my small RV.



by:

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



by:

These were a great addition to my creaky dual-axle boat trailer. The banging and clanging on bumps is gone, and swaying on bumps/corners is reduced as well. An excellent investment!



by:

Great price, great service, and lightning quick shipping that arrived sooner than expected. Thanks etrailer!



by:

Perfect fit for trailer with axle over leaf springs



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



by:

Got it and installed last week. Works for the trailer and I am happy with result

httpsThank you Etrailer.



by:

the mounting bracket should be shorter



by:

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



by:

I can't say as yet how they will perform as I haven't got them installed. I just received the springs today



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Only one on market


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See what our Experts say about this SuperSprings Intl Trailer Leaf Spring Suspension

  • Recommended SumoSpring To Supplement The Suspension On A Boat Trailer
    The SumoSprings Trailer Helper Springs # TSS-106-40 will definitely help take some of the strain off your suspension system. These are starting to get a lot more popular as they are usually less expensive and require a lot less work to get installed than a shock type system. As an added bonus, these can also help prevent body roll and assist with sway issues, so they are highly recommended. Being American made is just one more plus with SumoSprings in a pretty long list of positives in...
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  • Can SumoSprings Trailer Helper Spring Kit Fit with 3 inches from Axle to Frame
    The height of the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-106-40 is 4 inches for just the rubber spring portion of it. Since you have 3 inches from the axle to the frame that would indicate that there would be a compression of about 1 inch. This is pretty common when people install this and many like that it adds a little bit of trailer height from additional support.
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  • SuperSprings SumoSprings For a Coachmen Apex Nano 193BHS With Single Underslung 4,400LB Axle
    The TSS-105-40 is no longer available from SuperSprings. You are going to need their current SumoSprings Trailer Helper Springs # TSS-106-40 for your Coachmen Apex Nano 193BHS. This kit is designed for underslung axles with a capacity between 3,000lbs and 5,000lbs.
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  • Can Trailer SumoSprings Kit # TSS-106-40 Fit Distance of 7-3/4 inch From Spring to Trailer Frame
    The SumoSprings kit # TSS-106-40 does for sure fit your application based on the dimension you just mentioned of 7-3/4 inches from the spring plate to the bottom of the trailer frame. This kit works with dimensions here that range from 6 to 8-5/8 inches so no further measurements or dimensions would be needed to know this for sure fits.
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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.
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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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  • Where To Install SumoSprings Trailer Helper Springs TSS-106-40 On Trailer With Tandem 3500lbs Axles
    You got it! When installing the SumoSprings Trailer Helper Springs # TSS-106-40 on your trailer with tandem 3500lb axles the helper spring will get installed in the front part of the rear axle closer to the equalizer, and on the rear part of the front axle also closer to the equalizer. Keep in mind this kit only includes enough helper springs for a single axle so since you have tandem axles you will need two kits. I included a video review of the # TSS-106-40 for you to take a look at.
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  • Should SumoSprings for Trailer Axle Install in Front or Behind Axle
    The instructions for the SumoSprings kit part # TSS-106-40 do not specify whether they should install in front of or behind the rear axle but I would recommend in front of the axle since most shock is going to be first on the front portion of the axle and since there would be less horizontal movement when suspension compresses since it's on side without the shackle.
    view full answer...
  • How to Set the Preload for the SumoSprings Trailer Helper Springs
    You want between 1/4" and 1/2" of preload on the SumoSprings Trailer Helper Springs item # TSS-106-40. If not you'll get a harsher ride quality because the springs will always been engaged or you'll get nothing out of them because the suspension will have to travel too far. Three 1/2" spacers for each side are included with this kit to make sure the springs are mounted correctly. This process is outlined in the installation instructions I have attached below. Steps 2 and 3 will walk you...
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  • Determining If SumoSprings Trailer Helper Springs Fit 2021 Coachmen 192RBS with Tandem Axles
    As long as the leaf springs on your 2021 Coachmen 192RBS are underneath the axle and not on top, then the SumoSprings Trailer Helper Springs # TSS-106-40 you were looking at will fit perfectly. The springs themselves measure right at 4" so you will have a little bit of a gap but that is alright, they will still work as designed to absorb road shock while also taking some of the load off your suspension prolonging its useable life. You will install the # TSS-106-40 with the spring on the...
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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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  • What is Difference between SumoSprings Trailer Helper Springs TSS-106-40 and TSS-107-40
    The difference between the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-106-40 and # TSS-107-40 is the orientation of the axle to the leaf springs. So since you have an underslung kit the correct part number you need is the # TSS-106-40. The main difference is the height of the spacer that fits below the jounce (blue) spring. The relocation bracket that comes with these kits is so that you can slightly move a gas or utility line that mounts to the lower portion of...
    view full answer...
  • SumoSprings For Trailer to Help When Going Offroad
    SumoSprings will be exactly what you want for your offroad trailer to help cushion it over the more rugged terrain. The right one will depend on if your leaf springs are under the axle or over the axle. - Leaf Springs UNDER Axle: SumoSprings Trailer Helper Springs - Underslung # TSS-106-40 - Leaf Springs OVER Axle: SumoSprings Trailer Helper Springs - Overslung # TSS-107-40
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  • Does SumoSprings Trailer Helper Springs Include Two or Four Springs?
    The SumoSprings Trailer Helper Springs you were looking at are sold in a quantity of two, so you will need one set per axle. Now to make sure you order the correct helper springs you will need to confirm the axle rating of your axles, and check to see if the leaf springs are on top of the axle or underneath. The # TSS-107-40 you were looking at are designed for 3000-5000lb axles with leaf springs on top of the axle. If you have a 3000-5000lb axle but your leaf springs are underneath the...
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  • Suspension Enhancement Kit for Trailer with 3,500 lb Axle
    Depending on the axle configuration you'd either want the part # TSS-107-40 for if you have an overslung setup (axle over the springs), or the part # TSS-106-40 for if you have an underslung setup. These are perfectly rated for a 3,500 lb trailer axle so it would work great.
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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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  • 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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    Image 1 for
  • Can SuperSprings TSS-107-40 Trailer Suspension Helper Springs Be Cut Down if Too Tall to Fit
    According to the folks in the engineering department at SuperSprings, the manufacturer of SumoSprings it is acceptable to cut down the SumoSprings if necessary, but be aware that doing so will void the product warranty. SuperSprings recommends cutting as little as possible off the springs.
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  • Trailer Suspension Enhancement for 3500LB Single Axle
    I recommend the SumoSprings Trailer Helper Springs # TSS-106-40 for trailers with underslung 3500lb axles. These are designed to help cushion the ride while also absorbing some of the weight from the leaf springs. As they compress they will progressively become more stiff to reduce the load on the leaf springs. This will work on leaf springs with 3 leaves. If you have overslung axles the SumoSprings Trailer Helper Springs # TSS-107-40 will be the ones that you want.
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  • Recommended SumoSprings Trailer Helper Springs for Jayco Jay Flight Travel Trailer
    There are a couple of different options for SumoSprings on your 2015 Jayco Jay Flight Travel Trailer but which one works for yours will depend on the locations of your axles in relation to how they are mounted. If your axles are above your leaf springs you will want the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket item # TSS-106-40. These are for underslung axles. If your axles are mounted below your leaf springs you are going to need the SumoSprings item # TSS-107-40 for...
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  • Correct SumoSpring Suspension Upgrade Kit for 6' x 10' Cargo Trailer
    Since you have a small trailer you're going to need the 3K to 5K kit from SumoSprings so you aren't getting a really stiff towing experience. Then from here you just need to check and see if your leaf springs are located above or below your axle and choose the kit that matches your setup: - Overslung (Leaf Springs on Top of Axle) # TSS-107-40 - Underslung (Leaf Springs Below Axle) # TSS-106-40
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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 relative...
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  • Recommended SumoSprings Trailer Helper Springs For Trailer With 3500lb Tandem Axles
    Since your trailer has tandem 3500lb axles the correct SumoSprings Trailer Helper Springs is the # TSS-106-40 if your leaf springs are underneath the axles, or the # TSS-107-40 if your leaf springs are on top of the axles. Both of these kits are designed for axles rated from 3000-5000lbs which is perfect for your trailer, and will fight trailer sway and body roll while also providing support to your suspension to increase its working life. I included videos of the products mentioned for...
    view full answer...
  • SumoSprings Trailer Helper Springs For a 2022 Forest River Salem FSX 177BH
    The images I can find for a 2022 Forest River Salem FSX 177BH show that it has an Underslung axle and would require a SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-106-40. The SumoSprings Trailer Helper Springs w/ Line Relocation Bracket # TSS-107-40 is for Overslung axles where the axle is mounted below the leaf spring.
    view full answer...


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Info for this part was:

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