we had the same scenerios in the uk,, one minute ,you in the primery, then helpin a loader in a back of a unit, then onto irregs, then belt clearing or upon smalls, they call it multi tasking,, over the 13 yrs i was on ups ,it didnt improve, they even tried to hav a guy scannin 2 sepperate feeds on nxt 2 load bays together, and 1 stacker doin 2 feeds, our union reps didnt help, as they were on a nice steady easy task, and what you said in private to them ,got caarried back to the managment,, so we just worked to rule,,