This report describes the development and monitoring of two off-highway tridem pole trailers operating on Vancouver Island. The project was conducted from 1993 to 1997 by FERIC, and MacMillan Bloedel Limited. The report details the design and fabrication operational experience and productivity, brake maintenance costs, and braking performance of the tridem pole trailer. In addition, a cost-benefit analysis for converting conventional tandem pole trailers to tridem pole trailers was conducted.