It looks so fantastic... but, and sorry that i tell it again... i dont like the 10´ containers.
They are so rare, that they are looks so strange.
Little statement:
I´m from Hamburg germany, a city/state with one of the largest container-harbor of the world.
There are thousand of 20´ and 40´ containers. i never see the short 10´ containers. (But i know that they are exists.)
I think it´s looks more "realistic" if you youse the original UG-containers (20´) for tools, machines, plastic, food and livestock.
One neutral container exists too.
evtl. you can shrink the 20´ containers to a little bit (15´), so you can use 2 of these containers on the trailer.
looks a litte strange too... but not soo extreme like the 10´ containers.