Profile: Cameron Construction Company deals with building construction. Our Landmark™ 2000 structural system employs a special truss purlin that is exclusive to Butler. The system employs solid web primary frames, pre-punched truss purlins and rod bracing in the roof and walls. The Widespan framing systems allow for maximum use of interior space which is particularly important in manufacturing plants, warehouses, offices and retail stores, where uninterrupted space is required.