THANK YOU. Someone with some sanity.
And I have an even better analogy for the non beleivers.
Take your amp and strap it to your back and go for a walk. Sure there will be some minor shocks to the amp, but for the most part it is nothing since it is absorbed by your body.
Now take that amp, mount it to your washing machine and put it on spin cycle.
That is the type of vibraions times 100 that your amp will see if mounted to the sub box.