Axles are an a very important part of a wheeled truck or trailer, the axles allows driving torque to the wheel, as well as maintain the position of the wheels The trailer axles in this system must also carry the weight of the vehicle plus any cargo.
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A non-driving axle, such as the front beam axle will have no shaft. It is used only as a suspension and steering component.
In other types the axles serves only to give torque to the driving wheels ,"Axle"when talking about vehicles means parallel wheels on opposite sides.