I was under the impression that today drover refers to someone who drives an OTR truck filled w/livestock to the equivalent of a sales barn or slaughterhouse.
I always took the term to mean someone who had to do this driving for a long ways.
Could be wrong. It takes me several days of immersion to automatically understand a strong Australian accent.
I know a former pastor of a humongous Australian Church who did a missionary gig in America back in the 90's.
This fellow grew up in the outback and used to be a cattle driver (drover). He'd hire out to landowners to drive their cattle to market for a cut of the herd, just like the old American West.
The custom at the time (40's-50's) was to have cattle you ate along the way included as your "expenses". He always hunted so he could save his "expenses" to be sold at market along with his cut of the herd.
He had some wild stories about travelling on horse in the middle of the outback.