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Body-on-frame




In the USA the frequent changes in Automobile Design made it necessary to use a ladder frame rather than Monocoque to make it possible to change the design without having to change the Chassis .

Most small passenger vehicles switched to Unibody construction in the 1960s , leaving just Truck s and large cars using conventional frames. The switch continued for several decades - even SUV s typically use unibody construction today. Body-on-frame remains the preferred construction method for heavy-duty vehicles, especially those which are intended to carry and pull heavy loads.

The Lincoln Town Car dominates the American limousine market because it is the last American luxury car made with body-on-frame, which makes it easy to "stretch."


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