Have y’all tried having a meeting in the parking lot before the shift with door prizes of maybe Teamster shirts, cups or other cheap giveaways? Hand out laminated cards with phone numbers of Stewards, the BA or Union Hall as well as the website for the contract so they can read up on it before they need it? Inform them then about the meetings at the Hall. Maybe give them anonymous examples of how the Union has helped a member that month.
There has to be ways to get them more engaged. It seems like people are using old methods on people with new outlooks.