Engine 371 was alerted to 9201 Edgeworth Dr U.S. Postal Service transfer facility. While pulling out of the station we could see a column of smoke. Once one the scene E-371 layed out and requested the box  to be filled due to possible exposure problems. The  U.S. postal service has 175 loading docks and storage for 250 tractor trailers. E-371 found a straight box truck fully involved the crew extinguished the fire and returned to service an hour later.