This cart idea came about during the Hurricane Katrina crisis. Designed for gas cylinder delivery via helicopter, crane or land. Our goal was to keep the cart as low of a profile as possible for easy side-loading but also be able to move the cart with cylinders through doorways and elevators and get oxygen to wherever it is needed. This is strictly for FEMA transport. We did, however, make another version that includes a top hat and manifold bracket for manifolding cylinders together.