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Dexter Heavy Duty Suspension Upgrade Kit for Single Axle Trailers - Double Eye Springs

Dexter Heavy Duty Suspension Upgrade Kit for Single Axle Trailers - Double Eye Springs

Item # K71-358-00
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Trailer Leaf Spring Suspension
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Shipping Weight: 6 lbs
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K71-358-00 - Single Axle Dexter Axle Spring Mounting Hardware
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Upgrade your single-axle trailer's suspension with this heavy-duty hardware kit. 1/2" Thick, sturdy steel shackle straps replace the standard shackle straps on your trailer's double-eye leaf spring suspension for heavy-duty applications. Lowest Prices for the best trailer leaf spring suspension from Dexter Axle. Dexter Heavy Duty Suspension Upgrade Kit for Single Axle Trailers - Double Eye Springs part number K71-358-00 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (94)
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Dexter Axle Trailer Leaf Spring Suspension - K71-358-00

  • Suspension Kits
  • Spring Mounting Hardware
  • Double Eye Springs
  • Single Axle
  • Dexter Axle

Upgrade your single-axle trailer's suspension with this heavy-duty hardware kit. 1/2" Thick, sturdy steel shackle straps replace the standard shackle straps on your trailer's double-eye leaf spring suspension for heavy-duty applications.


  • Suspension upgrade kit is ideal for heavy-duty applications
    • Included 1/2" thick steel shackle straps will last longer than standard shackle straps
  • Wet bolts have built-in grease zerks
    • Fast, easy lubrication helps keep moving parts functioning at their best
  • Bronze bushings reduce wear and tear
  • Quick, simple installation
    • Shackle straps attach to springs and rear hangers to suspend leaf springs
    • Included bolts, nuts, bushings replace your existing suspension hardware
  • Includes:
    • 6 Locknuts
    • 6 Wet bolts
    • 4 Bronze bushings
    • 4 Shackle links


  • Application: single-axle trailers with double-eye leaf springs
  • Axle capacity: 3,500 lbs - 7,000 lbs
  • Shackle strap dimensions: 4-5/8" long x 1-1/2" wide x 1/2" thick
    • Length from center of bolt hole to center of bolt hole: 3-1/8"
  • Bolt hole diameters: 0.578"
  • Bushing dimensions:
    • Outer diameter: 11/16"
    • Inner diameter: 9/16"
    • Length: 1-3/4"

Easy Installation

It's easy to upgrade your trailer's standard suspension with this set of heavy-duty shackle straps. First, disconnect your leaf springs from the front and rear hangers. Then reconnect the springs to the front hangers and suspend the springs from the rear hangers using these thick shackle straps and the included bolts, bushings, and locknuts.

K71-358-00 Dexter Heavy Duty Axle Suspension Upgrade Kit w/ 1/2" Thick Shackle Links - Double Eye Springs - Single Axle

Customer Reviews

Dexter Heavy Duty Suspension Upgrade Kit for Single Axle Trailers - Double Eye Springs - K71-358-00

Average Customer Rating:  4.6 out of 5 stars   (94 Customer Reviews)

Upgrade your single-axle trailer's suspension with this heavy-duty hardware kit. 1/2" Thick, sturdy steel shackle straps replace the standard shackle straps on your trailer's double-eye leaf spring suspension for heavy-duty applications.


The package was majorly damaged, but thankfully, nothing inside was damaged. I'm unable to upload the picture, but I don't know why. I tried 4 different formats.
the other problem is the shackles. The shackle straps didn't fit together, so I had to pry them apart to get them lined up.
I was going to give a 3 star review, but since I can't even upload pictures of the destroyed box, 2 stars it is.

I apologize for the issues uploading a photo. If you send the photo to me, I can upload it for you.
-- Etrailer Expert Sierra K - 11/19/2021


Very happy with the quality/ thickness of the material.
Installation was easier than I expected.
Over all this is a good upgrade investment.


Great upgrade from what it was these units are pretty well over loaded soon as you take it off the lot 4400 pound spring assemblys and camper is 8600 empty these 5 leaf units should help


Peace of Mind. That is what I think of after upgrading the suspension on the trailer. From the brass bushings to the thicker shackles having a more sturdy and dependable suspension on the trailer gives me peace of mind when traveling around. My family did a big trip cross country last summer and I never had to worry about the suspension because I had upgraded to a more heavy duty set up. The dexter components I used are absolutely perfect with the road armor suspension equalizer that I installed. I definitely recommend upgrading the suspension from what comes standard on most travel trailers.



I am sorry that your items arrived like that. Was anything damaged or lost?
-- Etrailer Expert Sierra K - 06/21/2022


The Dexter shackle kit is a great upgrade and Heavy Duty in construction. A needed improvement over oem shackles and plastic bushings on our Forest River trailer.


This kit is really nice and east to grease the leaf spring bushings. The Dexter shackles are about double the thickness as normal ones. Great product!


I ordered the Dexter Heavy Duty Suspension Upgrade Kit and a set of leaf springs for my travel trailer, and they arrived in 1 box in 5 days (counting the weekend days) from Missouri to Maine. Very impressive especially for free shipping (over the $xx minimum). They all fit perfectly, and the shackles are way more rugged than the original ones. 3 of the grease fittings didn't take grease from my grease gun without leaking but were easily replaced with ones from the local auto store.


This was THE addition I was looking for on our used camper we just bought. Turns out the shackle straps had NOT been serviced every 25k miles and 2 out of the 4 sets had completely sheared through, others all compromised and ready too. This was missed at time of purchase and I towed it home without knowing, NOT SAFE.

I wont worry again about them AND I can now service the through bolt and provide lubricant to each pivot connection. I highly recommend!

It would of been a a 5 star for be, but out of box on 2 sets I had to manually bend and align all 4 pre anchored posts that were aready installed on one strap to match the pre-drilled holes of the other to align properly. It was as if they weren't dry fit before packing and shipping.


Another great product from Etrailer by Dexter. The shear size difference between the old shackles is huge. These are definitely Heavy Duty and will last a long time over the small stock ones. I like that all the bolts have grease fittings for easy maintenance. These shackles are Amazing and I will be installing a set on my Dads trailer this year. Great product and always great Customer Service.


Great product and well made Heavy Duty shackle kit,


The Dexter HD upgrade for single axle trailers is just what I needed to stop the squeaking and also provide stronger and higher quality axle suspension parts. There were no grease zeros and only plastic bushings on the original suspension parts. The kit was easy to install, with basic tools and moderate mechanical ability. Before I ordered I called etrailer confirm that I was ordering the correct parts and they made it easy to get technical support.


Purchased this product for my 2019 Nitro Z-19 bass boat trailer. These trailers are very well known to be extremely squeaky while going down the road and this product took every squeak away from the trailer. To be honest, I am amazed at how much noise reduction the wet bolts took away from the trailer.

If I had to do it over again, I would make a Before & After YouTube video so you could hear for yourself at how quiet my trailer is now. Installation is a little tricky, but if you know your way around a trailer and have the correct tools, it's really not that bad.

If you are looking to take the squeak away from your trailer, do not hesitate and purchase this right now!

My trailer is still amazingly quiet! I have to add grease to the grease zerk about once a month, but am still extremely pleased with this product.
Tony - 08/01/2021


My poor trailer has been drug through the mud , Literally, most likely 100,000 miles…., the suspension was wore out, very glad I know of your website and the parts arrived earlier then I thought, so i have them installed and ready to roll…. High quality and great service…


This was a major improvement. My Oliver rides very smoothly and we have noticed no more mayhem inside when we arrive at camp. The nuts have remained torqued so far, but I think a lock (cotter pin or nylock) of some sort would be an improvement for the bolts. I also noticed that the cntr to cntr distance is 1" greater than my OEM shackle which is a plus.


All parts that we ordered were quality and fit perfect. Ordering them was so informative on the web site we had no problem. The specs on all are parts were so explanatory, thanks etrailer


These should be standard on all new trailers/5th wheels! It borders on criminal that the great majority of new manufacturers use the thin metal straps that wear through to the edge in 25,000 miles or less creating a serious and possibly fatal risk of the axle breaking loose! These thicker, stronger straps with metal bushings - not plastic like on the O.E. insure durability, strenth and reliability. Plus, they can be periodically lubricated - another common sense feature missing from the O.E. units. While it took a few hours to install, it is a relatively simple and worthwhile upgrade that I would encourage others to consider. Plus, the trailer weight shakes less and flows better over rough pavement. Our unit is a 28' fifth wheel... but these are appropirate for any size TT or fifth wheel.


I was surprised at how beefy these were compared to my original pieces. I believe these will surely outlast me. Easy install, all fit perfectly. Quick on ship and delivery.

Works great, still going strong
Walter H - 11/18/2021


If you look at the pictures, you will see why I had to do something. This trailer is only 3 1/2 years old and has less than 3000 miles on it.
I only stumbled upon this when I was looking for something else! These work great! Just do your homework and verify your dimensions.

etrailer has been one of my go to sites for rv parts. Thank you so much for giving us the opportunity and pricing to help us doit yourselfers!

Working great a year later
Bart M - 05/17/2021


Great product to remove the squeak on my rv travel trailer. I did have to slightly tweak the pre-set bolts on the shackle so the other side would fit over the bolt ends. I did struggle with setting the eye spring bolts into the existing frame mount. You may have to drill out the frame eyes so your bolts will seat flush into the frame mount. Great job Dexter on this kit!



I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 05/04/2022


Shackles are beefy, greased easily (I tested them before install).
Much better than the factory original which had already worn after only 30,000 miles or so.
Being able to lubricate is a wonderful thing!

Still great. Whenever I replace my trailer, this will be one of the first tweaks I do before it is actually needed.
Gary - 10/01/2019


Unbelievable how much better 5th wheel pulls with thos kit on it. I will always use wet bolts from now on


I just received this product so it's not installed yet. So my high rating is based on:
1- It is exactly as pictured and described.
2- Quick delivery from time of order placement.
3- Price. If there is a better price out there I didn't find it.
I have ordered various items from etrailer before and have only been disappointed once. But that was on the manufacturer of the product, not etrailer. I was able to return the item and was credited in a reasonable amount of time.
I will continue to use etrailer.

I am still very satisfied with all the products you mentioned.Thanks for checking!
Kenrod - 02/26/2018


etrailer has delivered again. Great company for your RV parts. Looking forward to next trip to see how Suspension Upgrade works, but took trailer for short 10 mile test pull, & so far I think I'm going to be impressed.

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