I work for a private ambulance company in the US that shifts ambulances between states based off of emissions requirements. Crews working in California for exam

I work for a private ambulance company in the US that shifts ambulances between states based off of emissions requirements. Crews working in California for example will always get the shiny new ambulances, while those in Kentucky get ambos with 200k miles (slight exaggeration) to replace the ones that have been driven into the ground.