It took 107 years, but it happened. In 2005, a fire truck utility door was damaged when it maneuvered too closely to the open door of an ambulance and clipped it. Nobody was hurt, as long as you don't consider the collective human spirit, which surely was crestfallen when people managed to defeat absurdly massive odds and engender the least likely car crash in history. If you enjoy mangling statistics for sensationalist results, one could consider Mackinac one of the most dangerous places in the country to drive, when you consider how many accidents have occurred per vehicle on the island.
John Serba, "A guide to Michigan's M-185, the only U.S. highway where cars are banned", MLive, March 30, 2018.
While responding to the accident, a “pretty minor incident” occurred between a Mackinac Island ambulance and a Mackinac Island fire truck, according to Fire Chief Dennis Bradley. When maneuvering around the parked ambulance, which had one of its doors open, one of the fire truck’s utility doors hit the open door of the ambulance, causing minor damage to the door of the fire truck.
"Cause of Ferry Injuries Under Investigation", Mackinac Island Town Crier, May 20, 2005.