Arizona republican., 1919-07-27
By HARRY WtLKlN PERRY Manager Trailer Manufacturers Asso
 citation of America

cIatIon of America
 There has developed in the United States within the last few years an auxiliary means of transportation by highway that is next in importance to the motor ear and motor truck them selves and which affords the most eco nomical means of haulage. This is the trailer-a vehicle to be hauled by the motor vehicle as freight cars and pas senger coaches are drawn by railroad locomotives. The manufacture of these trailers has become a considerable in- dustry and there are now about 100 companies in the United States Sn gagged in their production. During the short time the United States was en- gagged in the war with German any Austria. more. than 2S,000 trailers were supplies to the American army for use as rolling kitchens, for hauling ord nance searchlights, airplanes.' pom toons. ammunition and supplies.
 Trailers are used in nearly all lines of industry and commerce that require haulage and delivery by highway. The trailer2 made by one company alone are now in service in more than 200 different lines of business and with S6 different makes of motor trucks.
 So extensive has become the busi- ness of manufacturing and selling trailers that the leading manufacturing companies have organized the Trailer Manufacturers Association of America and opened headquarters in New York City, at 110 West Fortieth street, for the purpose of furnishing information about trailerS and their use and to care for the interests of the industry in general
 Although trailers are a recent de velopement in highway transportation as compared with thte passenger auto mobile and the motor truck, they ha~ :, sc many obvious advantages and have rroved such an economical means of haulage that their use is growing rap idly An export trade is developing as countries beyond the United States are learning of the possibilit es of the trailer.
 Used with Any Motor Vehele
 Trailers are used with every kind of self propelled vehicle automobiles. light ard heavy trucks. road and farm ! tractors and heavy traction engines. They can be used as well with steam | by gasoline or kerosene. They are used for carrying passengers, for ligh, quick delivery work and for the heav- jest kind of hauling. Regular models range from a few hundred pounds capacity up to ten and fifteen tons. They are offered in two- wheeled and four wheeled types. The former are built in several styles, including the f,-o,J -1 - the latter in single and reversible types, with two-wheel and four wheel steering. Prices range from less than S100 to about S2,000 according to type and size.
 Trailers can be used wherever auto mobiles and motor trucks can be used 10 advantage, but the best results are obtained from traiiers, where here are good roads and no excessive grades to be surmounted, although many trail CTS are employed and economically and very advantageously in places where there are no improved roads. In fact, trains of slow speed reversible trailers are regularly used in road construction work, being hauled oy tractors or traction engines in trains of from five to ten trailers. Semi trailers and four wheeled trailers are much used also in numbering regions for hauling logs to the sawmills. A considerable number were employed by the United States spruce production corporation for getting out spruce logs in the Oregon forests to meet the sud- den and enormous demand of the air craft board for material for war planes.
 Use Surplus Engine Power
 The trailer utilizes the reserve or surplus power of the motor vehicle. Any good automobile or motor truck | that is not greatly overrated by the manufacturer has sufficient power to carry it's load over ordinary roads and up moderate grades fin high gear and to negotiate bad roads and grades of | 20 to 25 per cent in intermediate or | low gear. When running on good roads and on the level only part Of 1 the power the engine can develop is used. There is enough surplus power to draw at least one trailer carrying 8 l load equal to that on the motor ve- hicle itself, and often to pull string of two or three such trailers. Thus, by the use of trailers it is | NOfoh VI haulage with motor trucks by half and in some lines of business the cost can be reduced even more.
 Summary of Trailer Advantages
 The principal advantages of trailers may be summarized as follows: l l. By the use of trailers one truck | can do the work of two or three. | g. A double or triple load may be hauled by a single truck and one driver, at an increased cost of from 10 to 20 per cent for gasoline and general operating expense.
 l g. With a semi-trailer a given load can be hauled with a truck or tractor of third to one-half the size re- quired to carry the load on the truck itself.
 4. Occasional extra loads can be hauled with a trailer without over loading the motor truck
 5. Single objects too long or too heavy to be transported on truck alone can be hauled with trailers.