Now that you have made seniority, search out your steward.
Learn the contract and the seniority list.
Once you know both, identify the top 5-10 by seniority.
Now you're looking for the 2 or 3 that don't look scared, mad, or glassy eyed.
Befriend these drivers and listen to all they have to say.
You will be much better served with this system rather than following the advice you will get here.
I don't mean this as an insult to anybody giving advice here.
It's just that it is so different from building to building, like it or not.