
There's a trend to use Container Boxes in Self-Car Washes in Taichung, and that makes sense considering they already have lockable doors, are built to withstand the outdoor elements, and are easy to move.
Above the containers are medium-sized water tanks that feed into the box that then lead into a network of tubes which are distributed throughout the car wash. Once again, the base of the container is supported by cinder blocks, and that is a clear sign of non-permenant placement.