Last fall we bought an LSZ-1 from Sailrite. Before outdoor work really picks up here I sat down this week and sewed 48″ wide panels of treated canvas into a tarp. It slips over the standing support.
It is gusseted around all points where the rails attach to the boat as well as over where the long tail shaft comes out of the engine.
It fastens along each side to the frame of the boat trailer with 15″ rubber bungee cords. It is reinforced at the two front corners. The Ultrafeed LZ-1 by Sailrite performed flawlessly through up to ten layers of heavy canvas.