Yes. There was a boat hauler on Cape Cod who had 1,000,000 miles on a 1995 F-350 dually. My wife drove an F-550 rollback...when totalled, it had 930,000 miles. 400,000+ on a 7.3 PSD wrecker is COMMON!
Also note: International installed (and warrantied!) the T444E (what they called the 7.3) in medium-duty trucks, school buses, 10-wheelers, and even semi tractors!