I've forever been a little confused as to what you do. The Amazon thing makes me thing "warehousing" but the metal trailers thing makes me think "not warehousing".
Logistics! I help move other people's stuff around the world.
"Warehousing" isn't too far off the mark for my job. Since we don't hold onto anything, though, life revolves around taking stuff out of trailers and then putting said stuff back into trailers for the next leg of the journey.