Don't know how far from shore your dock is but I am using a 28 ft pontoon boat for my floating dock. I have mobile home tie down auger style anchors in the ground on the shore and have 25 ft of galvanized pipe attached to the boat and augers. Also I have another pair of augers attached to the boat with steel cable. It is very solid.There are commercial sites that sell those type of kits. I made my own. I welded automotive tie rod ends onto each end of the pipe and bolted to the augers and angle iron brackets on the boat... Just my 2 cents worth.

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