Large trucks are involved in only 8 percent of fatal crashes per year, but 17 percent of fatal fires. The scope of the current body of research is limited. Studies have treated truck fires generally as subset of vehicle fires or in their own right on a smaller scale, confined to a limited pool of data. This study, commissioned by the Volpe National Transportation Systems Center (Volpe Center) for the Federal Motor Carrier Safety Administration (FMCSA), expands the current body of research to collect and analyze information from government, industry, and media sources on the magnitude, trends, and causes of truck fires in the United States and to identify potential risk-reduction measures. / This study succeeds FMCSA's Motorcoach Fire Safety Analysis (2009), furthering the agency's mission to improve commercial motor vehicle (CMV) safety on our nation's roads. Focusing on non-passenger CMVs with a Gross Vehicle Weight Rating (GVWR) of Class 4 and above, this study combines several government and industry data sources to investigate potential causal relationships across truck fire incidents, crash rates, and fatalities.