Now, where was I? Oh yes.
Peter Jackson, the boat builder also supplies and lays moorings for the local boat club. He uses rejected railroad truck wheels in combinations of one each end for boats up to 30 feet, or two each end for bigger boats.
He uses truck tires which have been filled with expanded foam, with a board top and bottom, to make the mooring floats.
There is a span line ( usually with three styrene floats), between the mooring floats, for the boatman to snag with his boat hook, and so pull up the mooring leads which are attached to each float.