A method of conditioning a diaphragm of a patient is provided. The actuator is operable by a user applying a single manual operative motion to the actuator, which serves to expand the depth and width of the cart when it is placed in the expanded configuration from the collapsed configuration. The panels are formed of a plastic shell and contain a plurality of metal strips spaced therein and received within internal guide tracks or integral internal vertically-oriented trussing. for a period of time of no less than 15 seconds, and drying the pressurized mixed sludge to no less than 60 percent solids by weight. The side walls and the frontal walls are provided at their junction with projections and recesses which engage one into the other, with the result that the walls are held in an exact position. Various other examples of devices, assemblies, systems, methods, etc.