I've seen some people place their coop legs in cinder blocks and fill with concrete. Is that really enough weight to keep it from blowing over? We do get hurricanes here, as well as tornadoes and nasty storms. So far, we haven't had a tornado nor have we lost any of our furniture, etc. to the wind. I'm guessing, though, that with the size of the coop walls (4x4) that a good gust will blow it over. I can't do a ton as far as digging and such. Any ideas? I want them (and my investment) safe. Thanks!