Only if you're desperate for college reimbursement, become a PT supervisor.
Pros
The benefits are good and the tuition reimbursement is the only reason you should ever become a PT supervisor. If not, STAY IN THE UNION.
Cons
All they care about is numbers, not you. You have to beg for time off, the pay is poor compared to what you have to do, only recently did they pay if you worked more than five and half hours, you never get repairs for your equipment when you needed it, all the departments work against each other, they constantly under staff you and forces you to work which then leads to some of the union workers to correctly file a grievance with you. They lie to you about being promoted to full time management and they expect you to lie to your workers that they'll be drivers within 2 years, when it's realistically a five to seven year wait.