本文件规定了GCWR的最低性能标准和计算方法，以确定客车、多用途乘用车和卡车的牵引车TWR。这包括额定车辆总重不超过14000磅的所有车辆。

This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.