What can I do at UPS other than driving?

I've been at UPS for almost 5 years and have been driving for most of it. I like it but I'd like to progress in the company. I'm not interested in management and I'd like to stay within the union. I looked at internal job postings on workday and at available jobs on the UPS website. It looks like most of them are warehouse jobs and supervisor jobs. Obviously I'm past PT warehouse jobs. I was trying to find a mechanic apprenticeship but it looks like those jobs require previous experience. Is there something I could do that doesn't involve going into management?