Semitrailers covered by this specification are intended for use by the United States Armed Forces as a command post, a field medical station, or a large portable shop to house maintenance shop sets, tools, or other supplies for installing, maintaining, and repairing equipment in the field.

M447, M447C, and M447C Mod. models of semitrailers are used primarily to transport and house shop equipment over all types of roads and limited cross-country terrain, including paved roads, secondary roads, hilly and level cross-country terrain, Belgian block roads, etc.; and under extreme climatic conditions in arctic, desert, and tropic environments. Other uses for these mobile shelters includes maintenance (electrical, mechanical, or electronic) shops, parts storage and transport, etc. These semitrailers are tactical vehicles with full spare part and Department of the Army Technical Manual support.