Final answer:
The MHU-226 is a versatile munitions handling unit trailer whose capacity for storage boxes varies depending on the size and configuration of the boxes. A precise count can't be given without specific details or technical specifications for a particular operation.
Step-by-step explanation:
The MHU-226 is a specific type of Munitions Handling Unit trailer used by the military for transporting and storing various types of munitions. It is designed to interface with the PDU-5/B leaflet bombs but is versatile for other tasks as well. The capacity for storage boxes on the MHU-226 trailer can vary depending on the size and configuration of the boxes or the specific munitions it is designed to carry. Typically the MHU-226 is capable of carrying a mix of different types of storage units or bomb racks. However, without specific details about the size and type of the storage boxes, or the intended loadout for a particular operation, a precise count cannot be provided. For accurate information on how many storage boxes can be placed on an MHU-226, one would need to refer to the technical manual or specifications provided for that piece of equipment.