When my dad was in our Fire Dept years ago, they had to do the same thing.  Got to a fire and a car was blocking the hydrant.  They smashed the windows out and ran the hose across the front seat.  Another time they went to a call and there was a car blocking the road where they had to go.  As was already mentioned in the thread, a tow truck was not used.  They pushed the car out of the way with the truck and kept going like it wasn't there.