I know a few members have expressed some dissatisfaction with the organizing at the Teamsters national level. Unable to secure trucking companies, they have branched out to police forces, school bus drivers and all other trades and professional jobs.
This article talks about the UAW increasing their membership in these difficult times.

From grad students in Washington to public defenders in Philly, UAW organizes more than just autoworkers
The labor union known mostly for representing an estimated 150,000 employees of the Detroit Three automakers reversed a one-year drop in numbers after nine years of steady growth.
This month, the UAW will report to the U.S. Department of Labor a dues-paying membership of 398,829 - an increase of 3,125 members between December 2018 to December 2019, said Brian Rothenberg, UAW spokesman.
While membership growth is less than 1%, the union is no longer seeing losses.
Since March 2019, the union has welcomed new members from the Brooklyn Academy of Music in New York, McLaren Central Hospital in Mount Pleasant, Vegas casino workers from the Paris, Wynn, Bally's, Harrah's and Caesar's Palace, aerospace company Triumph Aerostructures in Florida and auto parts suppliers Euclid Manufacturing in Detroit, Faurecia in Missouri and Volvo Parts in Nevada.
As part of an overall strategy designed to buffer members financially, the UAW has continued to recruit outside the auto industry in areas such as law, higher education, gaming and health care. Member dues go to a single pot, so an engineer in California is helping to support strike pay in 2019 for an autoworker in Flint, Mich., and vice versa.