At 1830hrs the Stepney volunteers were dispatched to IFO 656 Main Street for a reported tractor trailer on fire. E-101 and E-104 responded with 9 personnel. While enroute units were advised by PD that the rear tires on a trailer carrying 1203 fuel were on fire. Units arrived to find a small fire in the rear wheels. Crews made quick work of the fire with a hand line and were placed back in service in just under 30 minutes.