The main priority for any gallery is to preserve valuable and irreplaceable collections of art. Accessibility is a priority. And if they are storing collections within mobile storage (which often achieves the greatest density), a vibration movement could possibly damage the stored items. Items are stored in conditioned environments, therefore the layout and the storage system itself must work with this, not against it.
Dexion's thorough knowledge of these requirements makes it the safest choice for any gallery.