The pic should tell you why we need a good suspension in trucks. The pic is from a test track however the roads in India keep in store worst conditions for the truck. The suspension design for heavy duty trucks is a extremely challenging task. There are some very strict rules that need to be followed to ensure that the weight of the suspension is low ( so that in effect the Truck's unladen weight is less) and also provide the right amount of stiffness to ensure good drive-ability. The design should consider worst case scenario's to ensure that the truck suspension holds even under heavy load conditions. Usually a factor of safety of 2.5 to 3 is considered in designs.
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