So I am classified as a feeder employee working in skid clean out, our job relies on drivers or shifters bringing us trailers to clean out and thus there is a lot of down time after we complete the task. A hub manager keeps coming over to us and telling us that when we have no trailers that we need to be helping hub employees unload bulk trains and irregulars onto belts. Is this circumstance something that a grievance can be filed for? Are feeder employees meant to do hub employee work on top of their own? Any insight would be helpful.