 The current, third-generation model, the 797F, offers one of the largest haul truck payload capacities in the world, up to and has the highest payload capacity among mechanical drive haul trucks.In 1997, Caterpillar decided to begin development of a payload capacity haul truck to meet the demand from large-scale mine operators wanting to reduce operating costs at mines using 80 to 90 short tons (73 to 82 t) per pass shovels.Engineers at Caterpillar's Mining & Construction Equipment Division in Decatur, Illinois, created a new design for the 797 using computer-aided design technology.