Apache, looking through the "Crestline Encyclopedia of Chevrolet Trucks" here are some of the logos seen on '55-59 trucks.
'55 Polka Dot sliced Bread, Maytag Appliances, De Paoli--contractors-builders, Lumber Mart, Bearden Foods, Schroon Lake Fire Dept., West Athens NY Fire Dept., Kramer Bros. Freight, and Independent Truck Line. 1956--fire trucks and U.S. Army. 1957--Fire Departments, 1958--Fire trucks, farm trucks, iron works, florist shop, bulk farm feeds. So it seems that Chevrolet trucks were used for just about any business there was plus many of them were pleasure trucks or combination utility truck-family weekend sedan.