Our Products       Cargo Systems knows one size does not fit all. We design our systems to fit your trailers. We recommend the right spring assembly system for safe, smooth, easy operation of your cargo door every time. Our torsion spring assemblies have been engineered for a life of 10,000 duty cycles when properly installed according to Cargo Systems, Inc. installation instructions. (Opening and closing the door equals one (1) duty cycle.) We’re serious about safety. Based on our knowledge and expertise, we advise you on the proper spring tension for efficient and safe operation. Cargo Systems recommends our spring assemblies only be installed, adjusted or modified by the original trailer manufacturer or an authorized dealer. Under no circumstances should the end user attempt to modify, adjust or replace a torsion spring assembly. How to get the best results for safe, smooth cargo door operation. Provide the weight of the door and door dimensions and Cargo Systems will determine the proper spring assembly system for your installation. We will help calculate the door weight, if needed to help select which assembly is right for your application. Most springs are standard 2” diameter, however we also offer 2-5/8” diameter springs and 3-3/4” diameter springs. CONTACT CARGO SYSTEMS AT: (574) 674-6904. Single Spring Assemblies Dual Spring Assemblies Custom Spring Assemblies We create specialized assemblies for doors with extra height, aluminum or steel tread plate, extra steel in the door or special flooring. We have customized assemblies to properly lift doors that are heavier (up to 600 lbs.), and 113” in height (or taller). Cargo Systems is a member of the National Association of Trailer Manufacturers (NATM).