This was an issue many moons ago when I worked on QF ramp so the company installed the "magic carpet" system in the 737 acrft holds. If the system was U/S then the number of bags to be loaded in that hold was limited.
On wide bodied aircraft there were always issues with loading hold 5 (bulkhold) and It was generally avoided if possible for OH&S reasons.
I'm assuming the problem is in the baggage room where containers are manually loaded and not the physical loading of the aircraft.