They are both decoration and practical. Semi trucks have long lug nuts holding the wheels on the hubs. The long lugs in the back are also installed in the front for practical reasons (less parts in inventory, less chances of installing short lugs on the rear, etc). If you don’t cover the extra threads that are exposed to the weather, they get filled with dirt, rust, etc. and the lugnuts jam due to the debris on the threads.
They used to have plain covers, but truckers want to make their vehicles custom to their personalities, so they buy spinners, chrome, extra lights, etc to make their vehicles unique.
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