An aboveground tank, mounted on a small, factory-built platform. 

At construction and farm sites, where fueling operations are performed on a temporary basis, it is desirable to have storage tanks available. Because of the temporary nature of the operation, however, it would be wasteful to install the tanks underground or mount them on permanent supports aboveground. In such instances, a tank will often be mounted on a platform made of various steel structural shapes, such as angle iron or beams. The platform keeps the tank from resting directly on the ground and also prevents it from rolling over. Further, the platform allows the tank to be dragged from one location to another at the site, hence the term skid tank. 

Dispensing pumps are sometimes mounted on the skid, along with the tank creating a self-contained dispensing and storage system that can be moved from one location to another.