Texarkana and Tyler are both region 1 but two separate communications centers serving two deferent areas. Texarkana repeats off Sulphur Springs, Marshal and Paris. Tyler only repeats with Canton. Tyler is also on TXWARN. While Texarkana itself is on GAATRS Texas DPS really use the VHF the majority of the time, I'm sure the VHF is patched to the TRS but I wouldn't rely on the TRS exclusively.