From a November 24, 1955 newspaper article this list of carriers with details as to the size of their fleets.
Associated Transport has a total of 3,700 vehicles at 96 terminals. The local Allentown terminal on Airport Road at Cooledge Street uses 26 pieces of equipment.
Eastern Motor Express, uses 23 units at the Bethlehem, out of 1,023 total in fleet.
Mason & Dixon Lines has more than 1,000 units in the fleet.
Motor Cargo, Inc. – 800 pieces of equipment
York Motor Express 800 in fleet with 175 operated locally
Branch Motor Express operates 185 pieces of equipment from terminals in Allentown and Reading, with 650 total system wide.
Modern Transfer Co. Inc has 400 pieces of equipment based at the terminal in Allentown, remainder of its 602 vehicles shuttle among 19 other terminals
Yankee Lines, Inc- 527
Daniels Motor Freight, Inc.- 500
Jones Motor Company-450
Highway Express Lines, Inc.-450
Garford Trucking Corporation- 450
Arrow Carrier Corporation-278
Follmer Trucking Company-160
Daley’s Blue Line Transfer- 137
Shirks Motor Express-115
Perkiomen Transfer, Inc-100
D. F. Blast, Inc-51
Easton Motor Freight, Inc-50
Bob Young Trucking, Inc-29
C.Keller & Sins-11
Clarke Motor Express-8