I'm assuming they aren't mounted, and even if they are, just lay them on their side. You could probably also stand them up since the odds of getting a dead spot on a tire that isn't on a car is slim.

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We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.