bing tracking image
  1. Trailer Suspension Parts
  2. SuperSprings Intl
  3. Leaf Spring Enhancement System
  4. Boat Trailer
  5. Camper
  6. Car Hauler
  7. Snowmobile Trailer
  8. Utility Trailer
SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung

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

Item # TSS-107-40
Our Price: $267.99
You Save: $41.00
Trailer Suspension Parts
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Need help with installation?
Locate installers near me
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 or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (80)
  • Q & A (0)
  • Photos
  • Used (1)

SuperSprings Intl Trailer Suspension Parts - TSS-107-40

  • Leaf Spring Enhancement System
  • Boat Trailer
  • Camper
  • Car Hauler
  • Snowmobile Trailer
  • Utility Trailer
  • Single Axle
  • 3000 lbs
  • 4000 lbs
  • 5000 lbs
  • 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.


  • 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


  • Application: 3,000-lb to 5,000-lb single, overslung axle - springs sit over axle
    • For tandem axle applications, use 2 kits
  • Capacity: 500 lbs at 50 percent compression
    • Do not exceed the trailer's weight-carrying capacity
  • 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"
  • 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:

Customer Reviews

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung - TSS-107-40

Average Customer Rating:  4.8 out of 5 stars   (80 Customer Reviews)

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


It seems to stabilize the trailer a lot better than the factory equipment. Less side to side movement and it seems that inside contents are not as bounced around as before.


I made some brackets to bolt to the frame. Now I have 100% contact with the Sumo Springs. The are working extremely well!


These were very easy to installed and have done a great job smoothing out the ride of the camper. It has made a big difference in how the camper tows and has calmed it down with crosswinds and when big trucks pass by. We did not have the clearance to install a shock kit and the tech at etrailer highly recommended these, I am glad he did. So far I am very happy with this product.



These are still going strong after a year of abuse from these horrible roads. I still feel that they have done a lot to smooth out the ride of the trailer.


My only complaint is that even with adding the two provided spacers, I was still a quarter inch short of touching the top rail. It is supposed to be set with a slight pushing down from the top rail. It went on easily and I am sure it will still work whenever there are significant bumps in the road.


Easy install. It took me approximately 3 hours for the entire project. That's cleaning a few things up also. I did not notice much difference in "body roll". Honestly,, I never had much before. Now, anytime going over rougher roads, railroad tracks, etc.... That was a big difference. It took a lot of that movement out. I hardly knew the trailer was going over it. I installed these on a 5th wheel.


Help a lot with the bounce from the leaf springs



Working great


For the money I believe its the best thing you can do to improve the ride of your trailer. Lessons the shock of the bad roads (like I-95 in south carolina) on the leaf springs and hangers.


Fantastic upgrade for the cheap factory suspension!


When I decided to replace the RV trailer leaf springs I decided to update the suspension by adding Sumo Springs as well. The installation was simple and quick. Between and Sumo Springs websites all the information is available for the do it your-selfer. Thanks for shipping to Canada. I will continue to support your company.


Easy Installation. I'm expecting them to act as shock-absorbers, and I haven't experienced any adverse handling issues, so I guess they're working. I haven't noticed any difference in handling, so I guess that's OK. I hoped for additional capacity, too, and that's hard to measure. Sorry this isn't more definitive, but I'm satisfied that they are helping.


Kit came with more than I needed but I can see where some trailers might have used different hardware and all scenarios were included in kit. I went with these to help eliminate my tires rubbing against bottom of trailer floor on rough roads "California" and give an overall smoother ride hopefully extending the lifespan of our trailer. I also Installed Dexter EZ Flex at the same time.


Installation was very straightforward and they made a significant difference in pulling.



Springs are still getting the job done~!


Simple call to identify part number needed, Fast delivery, Clear instructions, Extremely easy install.

Greg S.


Great spring support solution to resolve bounce and sway! Perfect addition to our 2019 Riverstone 5th Wheel


Was easy to install I removed the wheels which made it easy to access the u bolt flange that they mount to I moved the propane line further away from the area, took about an hour to complete install which included greasing the spring mounts.


These helped the tow quality of my boat trailer immensely. The trailer feels so much smoother on big bumps on the highway and the gear in the boat moves around a lot less than before. Super easy to install as well.


The only reason I can't give a 5 star is that we haven't taken the trailer out yet to test the sumo's.
From the install point of view, they were great! easy to follow instructions and assembly.

My only suggestion comes from my own mistake. Maybe consider adding an additional line to your step 1. "Ensure the landing gear / jacks / stabilizers are retracted before taking measurements". I had measured and installed two sumo's before I realized the gears were still down which, obviously, messed up my measurements. Thus I had to take off the sumo's, hook up the 5th wheel, raise the jacks, then restart the process. Went smooth after that. My daughter installed one with no problem. Thanks.



I believe they are working as advertised. They smooth out the bumps felt inside the trailer. I also installed sumos on our pickup. They make a HUGE difference when pulling our 5th wheel. Very satisfied.


One year in already? Wow time flies! These sumo springs have been a GREAT addition to our 32' travel trailer. Easy to install and they've been perfect ever since. I definitely recommend these!



Still so glad we got these ... Things stay put in the trailer, no matter how bumpy the roads get!


I had always taken the clover leaf ramps on freeways slow while towing my trailer from fear of tipping. It's stupid, but I feel much better going traffic speed on the ramps now with these springs installed on the trailer. I also feel more comfortable towing with side winds. I don't have a lot of experience towing in high winds, but the few trips I have done with moderate winds felt safe.


Was having a control issue with my camper, corresponded with Gregory and he knew what I needed to fix the problem, these mad hauling my camper enjoyable and not a white knuckle experience.


After installing the trailer specific sumo springs the trailer is more stable when towing. I would recommend this easy upgrade to your towable RV.


Installed with EZ-flex equalizer kit. Easy to install when the suspension is lowered. Make sure to measure the gap between the springs and frame before you take off the wheels. Seems like good quality and does improve the ride.


Great add on to our travel trailer suspension to assist in the ride of our leaf spring suspension. We also have MORryde 3000, HD shackle wet bolts , and X-factor crossmembers on our trailer as well. All of the above makes for a great towing experience as we tow our rig between 10 and 15k miles a year from upstate NY to the Rockies as well as traveling the Adirondack mountains and New England with plans for Alaska after COVID. Another great add are the Goodyear Endurance tires on our trailers....fantastic tires! We have a tpms for our trailer tires and I check tire temperature every 2 to 4 hours of travel
With an infrared thermometer.... safe travels!


Easy install needed to get more spacers due to distance from spring to frame happy with results


Short of installing independent suspension or adding shock absorbers (did this on my 2014 radiance, DIY project, lots of upside down drilling) this is the upgrade for you. Installation and directions are straight forward and only took me about an hour to install. Due to the COVID, we were only able to take four trips since we purchased our 2020 Grand Design 303RLS and these helper springs have made a WORLD of difference. The side to side motion is less and the ride is MUCH smoother. Also changed out our fifth king pin which helped with the chucking. Highly recommend these helper springs and as a bonus, dealing with etrailer is a great experience and they are always there to help and support. Customer service is Top Notch.


Although product was on back order etrailer kept me well informed on order progress which was appreciated. Seems to be a great product,untested at this time. Very easy installation ,hoping for the best.



Have had a great experience with sumospings on 31ft 5th wheel,8500 miles, smoother ride and less internal movement of objects.

Show More Reviews

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

  • Is There a Installation Video That shows The Line Relocation Brackets For SumoSprings Trailer Helper
    While we do not have a video showing the installation of the line relocation kit that comes with the SumoSprings Trailer Helper Springs # TSS-107-40, I have linked a video below that shows an example of when one will be needed and explains what the kit does. It is brought up at the 3:50 time in the video linked below.
    view full answer...
  • Picking Out Suspension Enhancement for 2018 Cargo Trailer that is 10 Feet Long
    We might have a suspension enhancement kit that could fit your trailer axles, but I would need to know the capacity of your axles. The kit you referenced most likely would be rated too high since it's for 3,000 to 5,000 lb axles. For lighter axles we have the part # TTRA1702 which was intended for 1,000 lb axles. If this would not work let me know what axle capacity you have and I'll see what we have that would work best.
    view full answer...
  • Using SumoSprings Trailer Helper Springs In Place of Shock Kit on Trailer
    The SumoSprings Trailer Helper Springs # TSS-107-40 are a great alternate solution to the Lippert Shock Kit that you mentioned when you don't have the needed tire to frame clearance. The jounce-style urethane springs will essentially act as shock absorbers to take a lot of the jolt out of bumps and rough roads and will definitely work to prolong the life of your suspension. Because they won't be constantly engaged like traditional shocks they aren't going to have quite the same effect with...
    view full answer...
  • 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...
    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...
    view full answer...
    Image 1 for Image 2 for
  • Best Way to Reduce Sway & Stabilize Travel Trailer Already Using Weight Distribution Hitch
    There is a good way for you to further stabilize your travel trailer and reduce sway. And since you already use a weight distribution hitch, and your Ram has Timbrens, the best option is going to be adding helper springs to your trailer. First, let's talk about the right fit, which will depend on your axle's weight rating, and if you have an underslung or overslung axle. An overslung axle means your leaf springs are over the axle; an underslung axle means the leaf springs are underneath...
    view full answer...
  • Which SumoSprings Trailer Helper Springs for 5080-lbs Axles
    I have a solution for you, but you won't want to use the SumoSprings # TSS-107-40 on your axle with over 5000-lbs rating on it. Instead, you'll want to use the # SS26MV which is designed for axles between 5,000-lbs and 8,000-lbs. If your axle is rated right at 5000-lbs then you could go with either set as long as you've got overslung axles.
    view full answer...
  • Will SumoSprings Trailer Helper Springs Increase Space Between Frame and Axle
    The SumoSprings Trailer Helper Springs typically install compressed so they do tend to provide more space between the frame and axle in most cases but not by much and this is not really the goal of the system. If you don't have enough space between the frame and axle then this may be due to worn out leaf springs so I recommend checking this but I have attached the SumoSpring options below which are based on axle type and capacity. SumoSprings Trailer Helper Springs w/ Line Relocation Bracket...
    view full answer...
  • Sumo Superspring Leaf Spring Enhancement System for Reflections Travel Trailer
    Yes, you absolutely can add a leaf spring enhancement system to your Reflections travel trailer. I recommend using the SumoSprings Trailer Helper Springs item # TSS-107-40. This is a single axle system that comes with a line relocation bracket. This leaf spring enhancement system becomes more rigid as more weight is added and works independently side-to-side to help balance off-center loads.
    view full answer...
  • Replacement Leaf Springs for 2020 Discovery Enclosed Trailer With 25-1/4 4,500 Pound Leaf Springs
    Typically you want your leaf springs to match your axle capacity. I'm not sure what axle capacity you have now, but assuming you didn't suffer a harsh ride with the 4,500 lb leaf springs the 25/1-4" 5,000 lb leaf springs like the # e44SR should be fine and hold up better. Keep in mind, you will still be limited by the capacity of your axle or whatever other trailer component has the lowest rating. I would not recommend moving to 6,000 lbs since that is quite a big jump over the 4,500 you...
    view full answer...
  • Brake Line Needed To Allow Installation of SumoSprings Trailer Springs On 2022 Grand Design Solitude
    You will need the Kodiak Hydraulic Brake Hose # bh-3mfs90ff-1-5 on your 2022 Grand Design Solitude 310. This brake line has a male 90-degree fitting you will be able to attach at your brake assembly and a female assembly on the other end where you will be able to attach your current brake line. This will ensure you get the clearance you need for the SumoSprings Trailer Helper Springs # TSS-107-40.
    view full answer...
    Image 1 for
  • Troubleshooting SumoSprings Compressed 1/2 to 2/3s After installation
    I spoke with my contact at SuperSprings to find out if this would present any issues for you. Although the amount of compression you are describing with the # TSS-107-40 installed is not ideal, they assured me that the system would still work as intended and would not cause a problem. With the amount of compression you are describing, you may need to replace your leaf springs. If you provide me with the measured distance from center eye to center eye as well as the capacity of your axle...
    view full answer...
  • Suspension Enhancement for Toy Hauler Options
    While we don't have add-a-leaf kits for your trailer we do have suspension enhancement options that will do a great job providing additional suspension support. If you have an overslung axle setup we have the SumoSpring part # SS26MV for if you have a 5k to 8k axle, part # TSS-107-40 for 3k to 5k. If instead you have an underslung option you would want the part # TSS-106-40 for 3k to 5k or part # SS33HR for 5k to 8k. Underslung means the spring is under the axle and overslung is opposite.
    view full answer...
  • Recommended Leaf Spring Suspension Enhancement for Trailer
    The SuperSprings Mounting Kit for OEM Leaf Springs Above the Axle # MXKT is designed to be used with a SuperSpring Custom Suspension like the # SSA28 and allows you to mount the springs above the axles instead of below them with the rest of the leaf spring pack. These springs are designed for a truck and not a trailer, so it's really not going to be a solution that would work for you. If you can tell us more about your trailer, like the axle capacity and how many axles there are, we can...
    view full answer...
  • 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...
    view full answer...
  • What Helper Springs do I need for my 2,000 lb. Trailer Axle
    The width of the clamp on portion of the SumoSprings Trailer Helper Springs w/ Line Relocation Bracket part # TSS-107-40 is likely not to fit the thinner upper plate on the lighter 2,000 lb. axle. These helper springs are designed for 3K to 5K axles. Instead, go with the Timbren Trailer Suspension Enhancement System Light-Duty Trailers 1,000 lbs part # TTRA1702 these will attach to the frame instead of the springs and have you in good shape. Check out the video I've linked for you.
    view full answer...
  • Can I Use SumoSprings Trailer Helper Springs w/ CRE3000 Equalizers?
    The only compatibility issue I can see is if your shocks are mounted directly above the center of the leaf springs or the top bracket has been replaced to accommodate the shocks. If either of these are not an issue then the SumoSprings Trailer Helper Springs item # TSS-107-40 will be a great addition to your travel trailer's suspension. I have linked a demonstration video below along with the instructions so you can see how this system works and the process to get them installed. These...
    view full answer...
  • Choosing Between Black and Blue SumoSprings Trailer Helper Springs for Overslung Trailers
    In regards to the SumoSprings Trailer Helper Springs for Overslung Trailers, you could in all honesty use either the blue part # TSS-107-40 or black part # SS26MV. It's better to be under than over so I do recommend the black but either will work. If you need to load a little extra you'll have peace of mind that your system can handle it. The blue will ride a bit better but the black will have more support. If you tow light then maybe the blue is best for you.
    view full answer...
  • Compatibility of SumoSprings TSS-107-40 with Trailer U-Bolt Plate
    The SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung # TSS-107-40 has brackets that are designed to fit up to 3 inch wide brackets according to my contact at SuperSprings. This fits the traditional trailer leaf spring widths of 1-3/4 inch, 2 inch, and 2-1/2 Inch but will not fit the large 3 inch slipper springs because the with of the U-bolt Plate will be too large. I am not sure what plate you are describing at there isn't a U-bolt...
    view full answer...
    Image 1 for
  • How Much Preload Should SumoSprings kit for Trailer Suspension Have When Installed
    One inch of preload is too much for the install of the SumoSprings kit part # TSS-107-40 that you referenced. You want between 1/4 and 1/2 inch of preload otherwise you'll have a harsher ride quality. If you have spacers installed you would need to remove them so that the preload lowers. This process is outlined in the attached install instructions link.
    view full answer...
  • Recommended SumoSprings Trailer Helper Springs for 2021 Grand Design Reflection 5th Wheel
    SuperSprings recommends the # TSS-107-40, which is designed for 3000-5000 lb capacity axles. Once installed, the springs would sit so the top is 6-1/2 inches above the top of the spring pack. Two 1/2 inch thick spacers are included, so if one spacer was added, it would sit 7 inches above the spring pack and 7-1/2 inches if both spacers are used. Ideally, you'd want to see about 1/2 inch of preload. To determine if the # TSS-107-40 would work, with the trailer on the ground as you'd typically...
    view full answer...
  • Recommended Kit To Reduce Suspension Bounce Towing a 4,400LB Trailer With 2018 Chevy Silverado 1500
    For the bounce of the trailer the SumoSprings Trailer Helper Springs will greatly reduce the bounce as well as provide some added stability for the trailer. The Underslung Kit # TSS-106-40 will work if your axles sit on top of the leaf springs. The Overslung Kit # TSS-107-40 is the one you will need if the axle sits below the leaf springs. If the bounce you are experiencing is in your 2018 Chevrolet Silverado the SumoSprings Solo Custom Helper Springs # SS95MR are the ones I recommend....
    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...
  • Fit of SumoSprings TSS-107-40 On Dexter Axle Leaf Spring U-Bolt Plates
    I forwarded your photo to the folks at Sumo Springs, and was told that as long as the spring mounts so its level and doesn't rock back and forth, you'll be just fine. From what's shown in your photo, everything looks like it's nice and level and stable. The engineering Manager at Super Springs assures me that their brackets are designed to work with several different styles of spring plates, including the ones with the ribs on them like what what's on your trailer. If you click the provided...
    view full answer...
    Image 1 for

< Previous
123. . .9

Do you have a question about this Trailer Suspension Part?

Used Items Available
Used Picture for SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung
Used Picture for SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung
Used Picture for SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung
Used Picture for SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung
Used Picture for SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung

Condition: Installed

Notes: Item has been previously test fitted and has minor cosmetic install marks and scratches.

Our Price: $261.38
Add to Cart
Secure Checkout

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Updated by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Manda E
Updated by:
Manda E
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Daron K
Edited by:
Daron K
Employee Jessie B
Written by:
Jessie B
Employee Jacob H
Installed by:
Jacob H
Employee Thomas T
Video by:
Thomas T

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.