Final answer:
Industrial and straight-mast forklifts maintain their rated capacity when extended, unlike telehandlers, whose capacity decreases as the boom extends.
Step-by-step explanation:
Industrial forklifts and straight-mast forklifts can hold their rated capacity when extended, as opposed to the telehandler which loses weight carrying capacity as boom extends. Forklifts, specifically industrial and straight-mast types, are designed with a lifting mechanism that can maintain a consistent lift capacity regardless of the extension of their masts. In contrast, the telehandler (telescopic handler) has a variable lift capacity that decreases as the boom extends due to the increasing moment arm and the stress on the hydraulic system. The further the boom extends, the less weight it can safely lift.