Heavy Duty Dock Springs
This is a set of Heavy Duty Dock Springs.
These springs were intended for a one ton service truck and have about 1800 lbs per inch compression strength. They weigh about 35 pounds each. FYI, my dock is a steel two slip with composite decking, steel roofing, a big swim deck, two boat lifts, a 24' deck boat, and a 21' fishing boat. The boats alone weigh 10k lbs. I estimate the total weight of the loaded dock around 30k lbs.
These springs are the size I have on my dock and they do a great job smoothing out the dock's movements.
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If your dock is a double slip heavy dock (like mine) or a two story double slip exposed to large water and the big wind that comes with that, then the Heavy Duty Dock Springs will handle your dock.