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Typical Suspension Travel for Trailer Leaf Springs on Boat Trailer  

Question:

Greetings, I have a tandem trailer with 3500# springs and axles. My boat is a 23 coastal cruiser that ways probably in excess of 5000lbs. Do you have any idea how much the springs will move under this weight? I know to allow for 3 of travel.

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Helpful Expert Reply:

For 3,500 lb springs like # e97SR you can expect 1-1/2" of spring deflection while at capacity. So assuming tandem axles at 3,500 lbs each that would be 1-1/2" at 7,000 lbs. Since your boat doesn't weight that much it will be a little less, but there is no way to calculate it exactly.

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Robin H

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