This document is a guide that explains the characteristics and implications of towing trailers without ABS (Antilock Braking System) or EBS (Electronic Braking System). It defines what constitutes a 'dumb trailer,' which refers to trailers equipped with fully mechanical braking systems lacking ABS or EBS. The guide outlines the differences in braking performance when a truck with ABS/EBS tows a non-ABS/EBS trailer, noting that the truck's braking system operates smoothly while the trailer's mechanical brakes may react more abruptly. It discusses the potential issues that may arise, such as fault lights indicating the trailer's braking function is not operational, which can also impact other truck systems. Additionally, the document provides practical tips for drivers, including the importance of adjusting braking styles and being aware of the limitations of non-ABS/EBS trailers. The guide emphasizes the need for awareness and caution when operating such combinations to ensure safety and stability during towing.