You are wrong dude... Im working in trailer lift axle air suspension system... Convoluted bellows are used in light vehicles and passenger vehicles as they are piston type bellows where they naturally dampens the vibrations and doesn't allow the vibrations of varying load to the chassis... Where as in other hands the convoluted type bellows directly transfer the load the chassis as it when compressed they transfer the reaction load to the chassis, so they are used heavy duty applications and they can cover very long distances and is very durable