If you had a rock solid case, and your Union representative will not attempt to even bring the charges up to company management,....contact your regional NLRB office.
I think you're in Region 25 if you're near the Indianapolis area.
The Phone number for the Indianapolis office,...covering all of Indiana is:
(317)-226-7381
Address:
NLRB Regional Office #25
575 N. Pennsylvania Street
Room 238
Indianapolis, Ind. 46204-1577
The NLRB takes cases of non-representation very seriously,...especially if there is more than one person complaining. Then it doesn't look like a lone disgruntled dues-payer.
Labor Relations Act of 1935 gives you specific Rights......and safeguards your "value-for-dues",..allowing for such things as "Beck Law" dues reductions. You can resign from a Union and pay a "maintenance fee", and essentially "de-fund" the Local,.....and they can't decertify you as long as 50% are paying full dues.
Plan it out.......But first, contact the NLRB,.....and make sure they know; a). there's more than one person involved,..and b). this is a National Master contract.
Once again,........in a National Pandemic,.....as truck drivers are being hailed as "Front-line Heroes" for doing their jobs......it would look terrible if a Union Official wasn't taking a hands-on approach to employee health and safety in a large barn with a National employer.......Maybe the local Indianapolis newspaper might want to do a story...of which there are 10 in the Metro Indianapolis area.
The Indianapolis Star has a "Call for Action" website;...
https://cfadatabase.org/cfa/submit-a-complaint.aspx You can file a potential news story and get a reporter to contact you.
No guarantee of action,....but, if I know my Union Officials,....I'd guess they don't like any Union member overturning their particular "rock"....
But,...if they're ignoring you,...AND the contract,...well,..what can you do?
Go with the NLRB first,....non-representaion,.....See how it flies,.....Then the newspaper.