I have a 6 1/2 foot by 12 foot open top trailer w/ 4 foot sides all the way around. I was thinking about keeping my equipment in it during the spring and summer mths. So i need a cover of some sort, but i need something that will hold up to the Nevada WIND, rain and sometime snow possible in May! Are there any company's that make durable covers that are pre fit or made for the spec.s of my trailer size. I thought about tarps, but they wouldn't hold to the wind. I need something like a canvas boat cover!! ANY HELP???