Hook and unhook various commercial combinations, to manually lower and raise landing gear, operates fifth wheel release levers, lock and release pintle-hooks, attach and release safety chains, open and close cargo doors, climb into and out of vehicles, and fuels and check oil/coolant levels of vehicles.?. Must be able to hook and unhook various commercial combinations, to manually lower and raise landing gear, to operate fifth wheel release levers, to lock and release pintle-hooks, to attach and release safety chains, to open and close cargo doors, to climb into and out of vehicles, and to fuel and check oil/coolant levels of vehicles.