Trunks
MEMS in Little Rock operates on the LR TRS, but in Conway proper (and Greenbrier), they operate on Conway's TRS - they have their own TGID on it. My guess is that they needed an AWIN TG to communicate on runs that are out of range os Conway's TRS, such as outer Faulkner County (Holland, Mt. Vernon, Enola, Mayflower)... - it would allow them to interop with both FCSO and Mayflower PD who operate AWIN TGs.
I've been meaning to add MAC3 to my TG list on my scanner, but haven't done it. I would imagine, however that when they communicate with Conway Regional hospital, they would still use the TGID on Conway's TRS dedicated for that purpose, or the statewide conventional Ambulance to ER frequency.