Parts Needed For Reducing 7,000LB Leaf Springs On a 2021 Keystone Carbon From Flattening  

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Helpful Expert Reply:

I do have a recommendation for you as switching out all your leaf springs on your 2021 Keystone Carbon 358 is a big undertaking. The SumoSprings Trailer Helper Springs # SS26MV are designed to work on 5,000lb to 8,000lb trailer axles and each set provides 900lbs or capacity at 50% compression. These springs are also progressive so they will help to absorb road shock while also providing support to your leaf springs giving a smoother ride inside your trailer to reduce the odds of damage to your belongings inside.

If you would rather change your 6-Leaf Double-Eye Spring for 7,000-lb Trailer Axles # e64SR for the 7-Leaf Double-Eye Spring for 8,000-lb Trailer Axles # DX74XR you will need to first confirm these are the correct length of 24-7/8" from eye to eye when not compressed. As this is hard to do you can also measure from the center of the leaf along the curve of the leaf spring to the center pin. This spring will have a distance of 13-3/16" for that measurement. As the 8,000-lb is only one leaf taller you will be able to use your same U-Bolts as long as they have the 3/8" thickness remaining on the threads. We do have 7" Long 3" Round Trailer U-Bolts # SP01-060 you can use for longer U-bolts. You would only need the U-Bolt Kit for Mounting 8,000-lb, Round Trailer Axles # APUBR-35 if you are changing to 8,000lb axles.

expert reply by: Bud M

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