How much weight can a floating dock support? The short answer is that it can support as much weight as a sectional dock built with the same weight capacity, and with the same stability. Thanks to advances in marine engineering, you don’t have to worry about your floating jet ski dock sinking under the weight of its load or under its own weight. PolyDock modular floating dock sections are among the highest quality, and the most trusted in the industry based on the criteria that people look for when choosing a floating dock system for their jet ski. Each section provides a capacity ranging from 225 to 3,375 pounds: here’s how you can determine what kind of weight capacity you need.