Arizona republican., 1920-04-13

use his touring car or roadster to wonderful advantage in conjunction with Trailmobile. He can make more trips to the city. and on each occasion, he is saving hours and hours of time-and time is considerable money to any rancher.
 Thousands Are In Use
 Thousands of Trailmobiles are in use in every line of business. In cases where six trailers are used, it is cus- tomary for the truck to be hauling two at one time, while two are load ing and two others unloading. The general experience of users of the Trailrnobile has been that the more Traiimobiles used with one truck as the hauling unit, the lower has been the cost of hauling per ton mile.
 Where Trailmobiles have been in troduced, the idea of hauling in that manner has spread rapidly. Messner expects Phoenix to be no exception in the Trailmobile and with his usual aggressive manner of putting his mer- chandise on the market, he is going to educate the people of Arizona as to their worth.
 The Semi TrailmobiIe
 One of the big features of the TraiImObile and one which has caused considerable comment wherever it has been introduced and demonstrated is the semi Trailmobile. The principal feature of the semi -Trailmobile is that it converts small power unit to large one The principle upon which it works is the placing of a fifth wheel on the body of light truck-and here is the big feature of the semi Trail mobile, patented coupling device. so simple that it is mechanically perfect, making it possible to attach and de- tach a semi Trailmobile from it's power unit with the smallest amount of trouble possible. It is thus made practical to use several semi -Trailmo- piles with one truck as it is with four-wheel Trailmobile.
 The semi-trailer is primarily a city job, but it has it's uses in the outlying districts too. The underlying prin- ciple in semi-trailer hauling ;s to pull a load primarily supported by two additional wheels behind the truck This load is so balanced that the truck may operate with the greatest freedom.
 One truck will also operate two or three semi That is, the truck is backed up to the semi trailer and driver or his assistant The coupling device is automatic. It is not neces- sary to spot the truck accurately to make the connection, and the truck can DacK m rom the side or any angle.
 The fifth wheel of the emi-trailer is suspended under the chassis frame of the semi -Trailmobi1e and rocks freely on a shaft working in journals which are riveted to the sides Of the frame. The lower plate is equipped with two heavy coil bumper springs which relieve the coupling pin and jaws from the shock when engagement takes place.
 Because the rocking device is placed in the upper part of the fifty wheel which is suspended from the semi Trailmobile chassis frame the truck and trailer are free to rock even though the truck and trailer are at right angles to each other. There is no chance that on uneven ground the rear wheel of the truck should be damned under the chassis frame and injury done to the tire
 These features of the Trailmobile fifth wheel are essentials to successful operation.
 The semi-Traimobile can be un- coupled from the truck by simply pull ing a lever at the drivers side, and left in position for unloading or load