Don't put them on your tires.
To elaborate on the tether, I'd recommend safety wiring the case itself, not to the arm. Just heard another story of the case detaching from the arm, so the safety wire didn't do anything. Drill a little hole near where the bolt comes through and use a safety pin so you can take it on and off. I know you weren't asking about this, but just a general heads up to whoever is reading.