Is it intended for the V-22? That would help narrow down what make and model it might be and may even possibly help find the manufacturer website and/or 3-view drawings.
Edit: Are you sure it is what you think it is? It is awfully small for being a
ground power unit, but looks a lot like a
wheeled fire extinguisher.
Edit 2: It is probably this model or a similar one:
H3R Aviation Model 600K (150 lb of Halon, 59 in/150 cm total hight, 42 in/107 cm cylinder diameter).