[lurquer]

Growing up around silos, I can tell you... of all the dangerous stuff on a farm, that was the one thing that folks warned about. They are death traps, particularly because it’s so damn tempting to climb up and get in. (As a kid, anyway.) Or, even as an adult, when you’re emptying it, it’s so tempting to step inside (on the bottom) and shovel that last big mound on the side down towards the center. (And, then get overwhelmed in an avalanche if the big stable mound isn’t as stable as you think.)

I don’t think vibrating would work. Some silos are several stories tall, and the grain isn’t rigid... in fact, it can be quite moist. Point being, vibrations won’t travel very far.