ES/ET Stackers Offer Precision and Strength in Small Spaces The Crown ES Series stackers deliver powerful performance, responsive control, excellent manoeuvrability and visibility so operators can work safely and productively in small spaces. The Crown ET Series is engineered for harsh and less-than-perfect conditions. The platform stackers are built to be rugged, precise and powerful. Put them to the test and you’ll find robust performance, simplified use and excellent control.