Excerpts from the report: Heretofore there has been no standard method to measure the heat transfer rate, or cooling load, of a refrigerated trailer body. Consequently, it has not been possible to determine accurately the performance of an insulated trailer body or to select the proper refrigerating unit to maintain a desired inside temperature. While most trailers probably maintain proper inside temperature, many do not, especially in the 0° F. range for frozen foods. This report covers road tests and laboratory tests at the National Bureau of Standards on several typical refrigerated trailer bodies. The object was to develop a reliable laboratory rating method which would simulate conditions in over-the-road movement. The road tests were conducted over the Ohio Turnpike. The report contains a detailed description of the facility, instruments, equipment, and test procedure to be used for testing. Adoption of this standard test method by the trailer manufacturing industry should result eventually in improved design and performance of trailers as well as better quality of perishable foods transported.