Another ambulance/towing firm was Kost Ambulance in Mankato, MN. I've posted some things about them before. They also had the local answering service and a repair garage.
Interesting how many towing companies were associated with ambulance services. The owners of the former Beacon Ambulance Service in Daytona Beach also owned a towing service as well as body shop and a medical oxygen & supplies co., and, I almost forgot, built ambulances under the Atlantic Ambulances banner. So they hauled you to the hospital from the car wreck in one of their Atlantic built ambulances, towed your wrecked car to their garage, provided home health care supplies when you got out of the hospital, fixed your car (if possible) and all out of the same billing office. Now that's one stop shopping. Kirk's in Oklahoma also operated a wrecker service, I believe.