I build my covers as tall as possible so they shed snow readily. Three colums supporting a ridgepole, all out of 1x3 strapping. The columns have plywood bases. I use clothesline to hold the ridgepole in place and support the tarp. Put the old tarp on first and a new one over it. Wrap them around the boat. Only thing that's ever gone wrong was when a tree fell on the boat in a spring wind storm. A new tarp is $50 every 3 or 4 years. More clothes line is $10 a roll. Cover costs me less than $20 a year and it basically recyclable. Shrinkwrap is great if you can afford it but a waste of resources IMO.
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