After the lake is drawn down for winter, I plan on refurbishing my old boat. Problem is, I live in a mobile home park and no place to work inside. I was wondering if anyone knows about a portable, tent like cover? I hope I described what I want clearly. I've seen these things like a canopy at Wal-Mart, but they are only 10'x10'. The boat is a 20'. I would apprecate any suggestion.