The South Wing request would keep you away from that loading area, but if you did get one of the Standard view rooms there that opens to the lobby the view from the balcony is not that great. From the 4th floor you are just above the roof and there isn't much to see. We love higher floor rooms in this same area that we have gotten while booking Standard view. The view out the other side of the room of the lobby and the open hallway really is nice.
With that being said, you might also consider adding a high floor request. This way if you do wind up above the loading area you would be further from the noise. I don't think A/C units are a big problem over there, but the back up beepers from the delivery trucks could be annoying.
Overall, don't worry too much and have a wonderful trip to WL!