We tried to avoid building permissions using the container in Germany. Unfortuntely, our muncipality was very strict and we just got a limited permit for five years. From my experience in Germany I can say that there are no general regulations. Requirements for permits depend on the person of your authorities you talk to. In some regions it is definitely worthwile trying to build small wind turbines on movable structures. However, if you do not want to use the container as a room for batteries there are cheaper ways of building movable structures.
--
Nico