I've heard them on 153.515 and 158.205, both 114.8 PL. The traffic I heard on 158.205 was referencing an address in Bessemer. I believe I've heard them on several other frequencies as well, but unfortunately those are the only ones I have logged.
They are
licensed for quite a few repeaters around the state. Most/all of them are licensed for MOTOTRBO voice, in addition to narrowband analog. Also all of the radios I heard in use sounded like Motorola XPRs, so they probably have TRBO capability if desired.