Think all service is created equal? Think again. Keystone Emergency Vehicles offers you true on site service. Our experience has shown us that 98% of all maintenance needs can be solved at your station. We don't want you to be out of service longer than necessary to fix a problem. No long trips to get your vehicle serviced means you are ready to serve those in need quickly. Before you agree to on site service, be sure you are getting Keystone's on site service.