my years with RHSL aircraft were done as following
a crew of 4 men 1 leading hand 2 drivers 1 non driver
1 driver to take loading belt,1 driver to get baggage trucks/dollies and to take non driver with him, this was to turnaround 737,757,A320 and small aircraft
another member of staff from another crew would step aircraft and if you was lucky enough to get the rest of the step mans crew they would join you on the aircraft unload the front then load the back outbound
min 7 men to turnaroud DC-10 , A330 ,A340,767,757-300
min 8 men to turnaround 747
seperate dept for chocks,pushback,groundpower units,headset man etc(these guys did NO loading or unloading off any aircraft)