Pottery Barn/William Sonoma is a $50 million account for UPS. And being as they ship seemingly random things (From couches to pottery to boxes filled with sand), we are supposed to baby every godlike PB box we get. We used to run PB/WS during the regular shift, until we nearly lost that account due to damages (Something about how the couches wouldn't fit out the trailer).
Then it switched over to another shift in our Hub 1.5 (They process air and a couple of other trailers, right down the street from the real building). Finally, a year after this, they brought it back to the main hub in our area and ran it after shift in an air shack. This resulted in UPS giving huge amounts of OT to the part time workers on the day sort.
I myself was getting an extra 10-20 hours a week doing these trailers after the regular 5-6 hour shift. This happened for about 5 months, beginning almost immediately after peak season. Naturally, this couldn't last, and they banished it back to the twilight shift, to be done during their regular sort. They now use a special wooden dock and two bay doors to get all the couches and other oversized boxes out of the trailers.
Of course, couches are just the baseline. We have gotten fully assembled tables in boxes too. These have to be delivered in the Big Berthas or even a regular semi trailer.