Is a sandwich pallet the same as a double-deck trailer?

No. A sandwich pallet is a pallet format — a load platform with two deck surfaces built into its physical structure. A double-deck trailer is a vehicle configuration where two horizontal load floors run the full length of the trailer, allowing two layers of pallets to be carried on a single truck. The pallet is the cargo platform; the trailer is the vehicle carrying it. Both involve two levels, which causes the confusion, but they describe entirely different components of a freight operation.

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What Is a Sandwich Pallet