system
Given the following post, respond as if you're commenting on Reddit:
human
eli5, why do truck trailers have smaller tires then trucks?

I see a lot of very large trailers being pulled by large trucks, but the tires on the trailers are super small. ELI5?
gpt
To lower the load height of trailer while not inhibiting inside with wheel well arches. It's most efficient to have completely flat floors inside semi trailers, but loading docks are a certain height, fork lifts are safer lifting to a lower height, people have to climb up into trailer, etc.