Final answer:
The maximum allowable amperage from a ground power unit cannot be determined from the given information without the specific technical specs or manufacturer's guidelines for the unit in question.
Step-by-step explanation:
The maximum allowable amperage from a ground power unit is not directly provided by the information given. However, the clues hint towards electrical concepts and calculations involving current (in amperes), voltage, and power. For instance, a specification like (600 Ah)(12.0 V) could be interpreted as a battery capacity (Amperes-Hours) and its voltage, which implies a 600 A capacity over an hour at 12.0 volts. Nonetheless, without the context of a ground power unit specification, it is impossible to accurately determine the maximum allowable amperage. The technical specs of the ground power unit itself, or the manufacturer's guidelines, would provide the precise limit.