Definition
A full quantity of palletized goods that fills a standard semi-trailer (typically 53 feet in North America). Optimizing trailer loads by maximizing the number of pallets and their stacking height is critical to minimizing per-unit shipping costs. Standard GMA pallets allow 20-26 floor positions in a 53-foot trailer depending on pallet orientation and pinwheeling. Trailer load optimization involves balancing pallet size, stacking height, and weight limits.
Related Terms
Unit Load
A quantity of goods assembled and secured on a pallet to form a single handling unit for storage and transportation. The unit load concept is fundamental to modern logistics — by consolidating individual items into pallet-sized units, material handling efficiency is dramatically improved. A well-built unit load is stable, within weight limits for the pallet and handling equipment, and configured to maximize trailer or container space utilization.
Pallet Pattern
The specific arrangement of cases, boxes, or other unit loads on a pallet deck to maximize stability, space utilization, and shipping efficiency. Common patterns include column stacking, interlocking (brick-lay), and pinwheel arrangements. Pallet pattern optimization software calculates the best configuration based on product dimensions, pallet size, weight limits, and trailer dimensions. An efficient pallet pattern minimizes wasted space and reduces shipping costs.
Freight Class
A standardized classification system used by the National Motor Freight Traffic Association (NMFTA) to categorize shipped goods based on density, handling, stowability, and liability. Freight class affects shipping rates, and palletized shipments that are denser and easier to handle generally receive more favorable classifications. Efficient pallet loading patterns that maximize density can lower freight class numbers and reduce shipping costs.
GMA Pallet
The standard 48x40 inch pallet specification established by the Grocery Manufacturers Association (now the Consumer Brands Association). The GMA pallet is the most widely used pallet size in North America, accounting for approximately 30% of all new pallets produced. It is the default pallet for grocery, retail, and general distribution applications, and its dimensions are optimized for standard 53-foot trailer loading.
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