Profile: Warren Mfrs., Inc. manufactures steel bulk feed trailers. We produce bulk feed transportation equipments and nitrate equipments. We offer standard drop gates, horizontal rack & pinion gates and inverted "V" rack & pinion gates. Our nitrate equipment includes welded aluminum construction, hydraulic low pressure direct drive unloading system, drop or inverted "V" rack & pinion gates, side or overhead boom discharge augers and OSHA approved offset bearings.