many airfields use ADSB VMAT's on their ground vehicles and label them accordingly to their tasked ops at said airfield. i see a ton of them at many US airports, and labelled as TUG**, OPS**, CRASH** etc etc most of them carry these https://www.freeflightsystems.com/blog/product/rangr-g/ use 978 MHz and are 100% integrated into ADSB
from personal experience from KATL and KPDK ( airports in Atlanta area ) Crash** usually is a crash recovery/firefighter vehicle or a fire battalion chief vehicle.