I have a 1996 Allegro Bus with a Cat Engine,Allison Trans.and Freightliner chassis.
Yesterday, while on a family outing, after about an hour of normal driving there was a loud bang in the rear and immediately the engine temperature started rising. I exited at the next interstate exit and stopped in a safe place.
The engine fan belt had broken. Luckily I had a fan belt on board and "The Good Sam" service mechanic had us up and running in about two hours from breakdown to back on the road.
Lessons relearned: Carry extra belts with you and it helps to have emergency service insurance. Also, scan your instrument panel at reguler short intervals.