Full grain bins don’t usually blow away.
We have a lot with 12 bins on it. 2 rows of 6. A few years ago, we had spent a couple days emptying some of them. Neighbors were outside watching a storm roll in. The bin closest to their house, the wind caught it, ripped the roof off, it goes way up in the air, spinning. At the same time, the side caved in and the bin went to the ground against the next one over. The roof landed a good 30 or so feet away, upside down, in the middle of the 2 rows of bins. Every bin that had something in it was fine, every bin that was empty had something mangled, roof panels with bolts ripped out, bent in sides, etc etc etc. That same storm, about a mile south, we have another lot that had 4 bins. We had emptied the 2 smaller ones recently. The 2 smaller ones were both scattered across the field they are next to, but mostly were still together. We finally cleaned up the concrete bases last week. The 2 small bins had a big one in between them that the sides caved in pretty good. I believe that one was partially full. Good times good times.