I ended up taking our 181 to a local canvass / boat cover shop. They made a very high quality, heavy duty cover with a perfect fit, using Sunbrella material. It was pricey but I'm glad I did it. Our trailer looks as good as the day we bought it almost two years ago and it stays nice and clean between trips. We live in Orange County, Calif, but I'm sure you guys have your share of canvass shops back there.