multi-leaf spring for have duty truck, standard leaf spring: Howo system,Styer system, 6X4,6X2,4X2,8X2 and more. leaf spring for have ... duty truck, standard leaf spring: Howo system,Styer system, 6X4,6X2,4X2 ... ,8X2 and more.our leaf spring use for heavy duty truck, trailer,semi-trailer.Use the ...