In October, 2010, I experienced a significant problem with a PJ Dump Trailer. My issue is with the engineered (or lack of engineered) design of the trailer. Typically, a hydraulic system is designed with a bypass pressure relief valve that is designed to be the weakest link of the hydraulic system. The relief should be set to relieve the hydraulic pressure [sending the fluid back to the reservoir] prior to the hydraulic ram exerting enough force to destroy structural members of the system. In other words, the pressure relief valve is much... read full review »