Well the big Cover-Alls around here will at one point or another have to live through 50-70 MPH gusts. Every so often we get a nasty plough wind that'll take the roof off of a house or industrial building so I expect the engineering that needed to be done to keep these together has been done. If not Cover-All will be pretty embarrassed when their plant blows down.
Since they started here you see lots of them around this area. I personally haven't heard of one blowing over yet. Of course lots has to do with how you anchor it down and assemble everything. From what I've seen you probably aren't going to have any problems that a hard building wouldn't have.
Check out their web site
http://www.coverall.net/
The big ones on the bottom are the plant here on the outskirts of town and are big enough to swallow the two storey buildings in front of them.