Trailer Leaf Spring Recommendations for a Boat Trailer with 1,900 Pound Boat

Question

Question:

I have a boat trailer for a 18 ft fiberglass boat the bare weight of the hull is around 850 lbs. Buy the time I get the motor on it gas tanks batterys and a few other things I figure the boat will weigh about1600 to 1900 so I want heavy duty springs so I was looking at these springs but would these stiffen up the ride over stock springs or would this be a problem thanks

asked by: Ben C

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Expert Reply:

The leaf springs should be rated to match the axle on the trailer. Spring # e27SR is rated for 2,250 pounds per spring so it fits 4,500 pound axles. These springs would be overkill for a boat weighing up to 1,900 pounds and it would be a very stiff and jarring ride for your boat.

Your trailer axle may have a capacity listed on it somewhere and if not then there should be some capacity information on a placard or sticker near the front of the trailer somewhere. Whatever the gross capacity of the trailer/axle ends up being is what you will want the combined capacity of the springs to be. A little higher is fine but never lower.

So if you had a 2,000 pound axle you could use # e84SR, # e77SR, or # SP-113275 depending on the length needed. The next step up from there is # e66SR rated for 2,500 pound axles.

Beyond that the next capacity is for 3,500 pound axles and even those would be too stiff for a 1900 pound boat.

expert reply by: Michael H

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Answer 1

Based on measurements alone the etrailer Rust-Resistant 4-Leaf Double Eye Spring #e68SR would work as a replacement. However, the one thing you will need to find is the axle capacity on your trailer. Try checking for an axle tag to see if it is…

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Answer 2

It is tough to get a correct eye-to-eye measurement on a double-eye leaf spring when the spring is still installed in the suspension. It is much better to measure for a replacement leaf spring by removing it first. Also, if a spring is very old and…

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Answer 3

For the LCI52-SB-86.5-68.5, the two ending measurements are: 1st - measurement from hub to hub, meaning the length of the axle in this case is 86.5 inches. 2nd - spring seat dimension where they're welded, meaning the spring seats are 68.5 inches…

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Answer 4

The 4-Leaf Slipper Spring w/ Flat End part #SP-040275 is designed for 9/16" bolts only, the Spring-Eye Bolt with Locknut for Slipper Springs part #166079. There isn't any way to use a 3/4" bolt with this leaf spring nor do we have an…

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Answer 5

If the trailer wheels scrubbed (dragged and scrapped the ground instead of rolling) when jack knifed then it could have thrown something out of alignment or damaged something. First, inspect the suspension. Look for any elongated holes where…

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Answer 6

It sounds like your current suspension set up is underrated for the application. But not to worry because we can get you set up. The springs for 7K axles, #e64SR, are going to be stronger so they will not sag as much and retain the ride height…

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Answer 7

We don't offer airbags, like what is normally installed on a tow vehicle, for trailers. We do have jounce-style helper springs that may work for you. The Timbren Trailer Suspension Enhancement System #TTRA1702 install onto your trailer's…

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Answer 8

The amount of leaves does not necessary indicate capacity so it is possible that the springs you are using are under rated for the trailer. There could also be other suspension components that will need to be replaced. Check for signs of obvious…

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Answer 9

Since you do not know the capacity of the trailer axle then you can't go by the capacity of the springs. If the axle is rated for 2,000 pounds and the springs for a 3,500 pound axle then you would still be limited to 2,000 pounds. If you have the…

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Answer 10

You are indeed right to think this way. When picking out the appropriate leaf springs for your custom built trailer you will want to choose them based on what the actual loaded weight of the trailer will be. Just make sure that the leaf springs have…

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Answer 11

You can use leaf springs that are rated higher than the axle without any issues as long as they measure the correct measurement for your trailer. For example the 6-leaf double eye spring for 7,000 lb axles part #e64SR measures 24-7/8" eye to…

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Answer 12

The torque requirements for leaf spring u-bolts depend on the diameter of the u-bolts that are being used. If the gross weight of your tandem axle trailer is 7,000 lbs, then you likely have two 3,500 lb axles. Typically 1/2 inch diameter u-bolts are…

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Trailer Leaf Spring Recommendations for a Boat Trailer with 1,900 Pound Boat

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