This is actually a snap shot of what happened to my old uncle who carted coal in the Lower Hunter many years ago.

My uncle was a happy lad, driving his little tipper making a few dollars when Mr Union said "if you and your follow workers join us we will get you more $$ per tonne.

So with the money he went for a bigger truck and made a few extra dollars, thanks Mr Union,
Next year Mr Union said we can do better again.

My uncle wasnt a greedy man but he upsized to a bigger rig again, life was good, money for holiday up the coast, brough a little fishing boat.
Thanks Mr Union
Now I know your thinking my Uncle owes a lot to Mr Union

No that was not his next rig.
A few years on and clever business man (not a hard working follow truck driver) put a proposal to the mine owners on how he could run a fleet of B-Doubles and sub contract the cartage saving the effort of many smaller operators. Mr Union backed this as the highly paid drivers were all made to be members.
Mr Union didn't care that my uncle no longer had a job as less drivers were needed. (lucky he was close to retirement)
Yes...... No thanks Mr Union
(all photos just random Googled)