... 6*4 special truck. 1.Container semi trailer : flat bed semi trailer and skeleton semi trailer ,used for transport 20ft,40ft,45ft,53ft ... equipment, such as excavator etc.3.Dump semi trailer: Side tipping or rear tipping semi trailer ,used in mining area for transport mineral,coal ... and transport for grain; sands,grain,4.Fuel tanker semi trailer: Tanker capacity:30-60m3;5.Concrete conveying pump/boom pump ...