Steel Truss Element import companies and steel truss element import trade opportunities

Iam civil engineer and I look for the followings:- 1- pre-fabricated buildings 2-elements of pre-fabricated buildings 3-steel structures 4-trailers and movable trailers( elements for fabrication) 5-light weight buildings 6-large span stores or hangers 7-steel truss elements ( H beams - purlins-etc---)