I've never done that job, or worked in that field, but there use to be a tank farm near Pittsburgh, and from what I saw:
Ships unload to huge tanks (the kind that are a couple of stories tall and even wider than they are tall).
Trucks load from huge tanks.
You never wait on a ship to unload.
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The tank farm near Pittsburgh was there for many decades, than one holiday the regular person who over saw unloading was not there, and someone else tried to unload a barge into a huge tank that did not have enough room left in it to fit all the liquid into it. When the tank filled up completely the transfer pump continued to pump (the barge was not empty yet) and the pump caused pressure to build up in the huge tank. That pressure exerted on each square inch of that huge tank, was much more force than any tank could handle, and the tank had a huge failure. Luckely the was no fire, but there was one heck of a mess.
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There are schools you can go to for becoming a truck driver.
One of my sister in laws has a brother who went to school and became a regular truck driver. One of the big rules is that you are never allowed to back up while on the road. One day he over-shot an exit, stopped just past it, and backed up to take the exit. Another truck from the firm saw him do that and reported it. He got fired and his name is now on a list not allowing him to drive a truck for life.
