... and 3.5"2) Characteristics: JOST type---PCMK fifth wheel is made of the same material and of ... of JOST. All the parts are interchangeable with JOST fifth wheel.3) funtion: assembled at the tractor, to ... king pin5) detailed specification shown on PCMK website2" Fifth Wheel Model PM-QD50-173(6)1) mounting height ... of semi trailers and trailer parts, such as 1) fifth wheels (2" and 3.5"), 2) king pins ...