Abstract: A mobile tank chassis is provided and includes an upstanding outlet pipe for the tank having upper and lower sections with the lower sections supported from the chassis and a union removably and sealingly coupling and supporting the lower end of the upper section on the upper end of the lower section. An elongated upright support including upper and lower portions generally parallels the pipe and hinge structure pivotally supports the lower end of the upper portion from the upper end of the lower portion for angular displacement of the upper portion relative to the lower portion about a horizontal axis between a upright position and a generally horizontal position disposed over the tank portion of the chassis.