Overtime doesn't really matter to you when you are on your sixth or seventh straight 11-13 hour shift due to poor scheduling, lack of staff or whatever. And the overtime rate I got about 5 years ago was capped at 1.5x normal rate over your weekly rostered hours, not just how much more you worked on a shift. Not that it mattered, the rotating roster included late nights, early starts and weekends with no penalties for those hours.
I see a lot of pilots complain about how dangerous back of clock operations are, but no one bats an eyelid at someone working rotating 10-12 hour shifts that start at say 4am or finish at 1am driving 10-20 tonne vehicles up to aircraft.
Ground handling has serious fatigue issues that aren't even vaguely taken seriously by the industry.
Every employee deserves to leave the job site alive, no matter what their wage.