"Lightweight wood trusses are a common building component throughout the United States, especially for residential occupancies. Premanufactured trusses are engineered and fabricated to carry building code mandated structural loads. The Wood Truss Council of America (WTCA) produces a 'New Hire Program' to train construction workers on the appropriate use of lightweight wood truss assemblies. Trusses should be protected from damage during the manufacturing, transportation, and job-site storage phase of project."
Coffee Break Training - Fire Protection Series No. FP-2006-20
United States Fire Administration: http://www.usfa.fema.gov/