Upgrade your dock with a pair of Progressive Rate Dock Springs fabricated from brand new truck suspension coil springs. The variable rate design starts at around 800 lbs/inch and increases as the spring is compressed, providing optimal support for your dock. Each set comes with a pair of anchor shackles for easy installation, making it a hassle-free and effective solution for your dock needs. Say goodbye to the hassle of constantly repairing your dock and enjoy a smoother, more reliable experience with Progressive Rate Dock Springs. 

AI wrote that for me...  Not sure if I am a fan of AI yet but it took my words and smoothed them out some.  Progressive rate springs will be what most dock owners need.  They weigh about 34 pounds each and shipped will be 72 pounds.