It looks like you are referring to a 1955-2nd series Chevrolet truck. 255 indicates 2nd series of 1955 trucks - a Task Force Truck.

A long-bed 1/2 ton Chevrolet truck became available in the 1955-2nd series. It was designated as a 3200 series (1/2 ton long-bed). 3100 was the designation for the 1955-2nd series 1/2 ton short-bed.

Is there a letter in front of the vehicle ID that you gave?

255K013245

I think that a 3200 would have had an M preface.

M 255 K 013245
M = 3200
255 = second series 1955 (Task Force truck)
K = Kansas City assembly plant