The chassis manufacturer's specified maximum load-carrying capacity for tractor trailer-type vehicles having three or more axle systems. Note: A multiaxle installation is one system. NFPA 1901, 2003 ed
National Fire Protection Association, Illustrated Dictionary of Fire Service Terms, Jones & Bartlett Publishers, MA. USA 2006. https://books.google.com.kw/books?id=W0WIRa3Gl4QC& printsec=frontcover&source=gbs_ge_summary_r&cad=0# v=onepage&q&f=false, (Fr Srvc - Amer) {141}