I've been working here for 2 years now in local sort (nights 6pm-10pm), i'm a 6'4" 200 pd guy, and i can handle the stressful work, but they recently hired a new employee 3 months and have placed her in a position of lifting very light weight boxes (smalls), and i'm still in a trailer that gets pounded with alot of 50 60 70 pound boxes. i complained about it and management said there's nothing they can do, and i asked the sup. and he said he doesn't want her in the trailer i'm in (for reasons i don't know why), should i let this go and brush it off, or should i demand to have the easier job if i have more seniority, i want to make driver some day, so i don't want to argue with management.