I don't know what they were/are called - the feeder trailers with the rollers down the middle, plywood fold-up shelves on the side. I understand that is what UPS used exclusively in years past. For any of you who used those exclusively in the past - my hat is sincerely off to you - for staying with UPS, as well as surviving this long. One of our doors gets one every once in a while. Today it was horrendous rainstorm from 3am-9am, the thing leaked like a strainer, and for some reason, it was tilted so the packages ran back INTO the trailer. Wise-ass sorter (that I like by the way) kept yelling "LEAKER!!!" every three seconds, belt shutting down, packages rolling backwards at me, and plywood sides falling on my head. That, added to every time a SUP walked past, they said "Oh, Yeah, UPS was to get rid of these YEARS ago" I could not leave work soon enough today.