... kingpin. 2,2" and 3.5" kingpin. 3,used for trailer. We can supply 50 and 90 fifth wheel. 1, ... is an ISO9001:2000 and TS14969 manufacturer of semi trailer axles assembly,providing all kinds of suspension system and ... customers with assorted and high performance 9T-18T semi trailer axles assemble,24T-36T single point suspension(bogie) assembly ... 90# kingpin.2,2" and 3.5" kingpin.3,used for trailer.