How many atoms fit inside a semi trailer?

I have it on good authority that more atoms will fit in a semi trailer than you know what to do with. Of course, it all depends on what the atoms are of. Certainly a semi trailer full of hydrogen could possibly hold more atoms than a semi trailer full of plutonium--the plutonium atoms are larger than the hydrogen ones. The flipside is, hydrogen comes in many states. If you were to freeze the hydrogen you'd get far more atoms in the trailer than if you were to just squirt in a little gaseous hydrogen. if you were to put frozen H2 in a trailer, when it finally melted then gasified, the expansion would be considerable--enough to blow the doors off. Rest assured that if you called your fleet manager and told him the load blew the doors off he wouldn't be happy with you.

In short, I have absolutely no idea how many atoms will fit in a semi.

The answer is "a truck load".