Has anyone ever worried about their coop blowing over in high winds? I have a movable coop (not willing to keep it in one place) about 4x8x4. http://www.henspa.com/Henspa Features.htm We can sometimes get sustained winds during a storm of 40mph with guests to 60+mph. The coop weighs about 300 lbs but I am still really concerned about it blowing over some nights. I also want to raise it up off the ground on wheels to give the Hens some shade come the summer. I am concerned that with the added height that it will be even more unstable. Is this all an unfounded fear or should I be legitimately concerned? Any suggestions on how to add stability WITHOUT making it unmovable?