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Prior to World War II, most heavy duty highway trucks and tractors were built as Conventionals, i. e., with the cab mounted behind the engine. In the late 1940's cab-over-engine types gained acceptance and in the 1950's the tilt cab COE was developed in its present form including sleeper cabs. The new concept is to combine the best features of conventionals and tilt cab COEs to develop a superior non-sleeper tractor that makes no compromises for sleeper cab types.

Past experience in the design of construction equipment has shown the importance of being able to assess as accurately as possible the predicted life of a machinery's structural components. A procedure is described wherein, through proper initial planning of tests, data may be obtained that will facilitate the prediction of future component designs. From the information secured, it becomes possible to graphically relate a component's stress-time history and thereby arrive at a suitable requirement for a new design.