SI SYSTEMS assembly conveyor systems for vehicle component assembly are at work in every environment, from the harsh foundry conditions to the unique demands of specialized assembly. Utilizing state-of-the-art technology, SI's towline systems feature a smaller foot print then AGV, provide four side access, during the assembly operations, and can be provided with customized fixtures that lift, lower controls, and rotating product making the assembly process ergonomically favorable. The same SI Systems technology employed for complete vehicle assembly can be utilized for the assembly of "vehicle components".

For decades, SI's sub-assembly systems have been used to assemble diesel and gasoline engines, transmissions, axle and suspension modules, operator cabs, and other such vehicle components. In many cases these sub-assembly systems are located adjacent to the final assembly system and provide the sub-assemblies in a coordinated and integrated fashion.