The Union is not your friend.
Personally, I was Management and not ever a Teamster, but I always have had Teamster friends. Some of them succumb to the lure of the Siren of that Cult. Others just want to work and take care of their families.
I was one who refused to ever be a part of of it. Perhaps long term that hurt me financially but I doubt it. There is no way that I could ever be a part of the culture myself.
As above, I have many friends who did. It was just not for me.
Used to travel a lot for my business. Drove 50k most years in that travel. Got to know a lot about truck drivers. Generally a good hard working bunch of guys. Some were too impatient with stupid drivers and it made a bad situation worse. Most were great to have with you on the road. Used to communicate by CB in the 1965 to 2000 era. That helped a lot. Joined with truckers in a half dozen instances saving lives in bad accident situations.