tire

"We had to repaint our house, and to do that we had to remove the stairs in the backyard. My dad whipped this up so we could still use the door."

No, wheely.

"Where did I put the science?" "Glove compartment." "Thanks, brah."

But is it airtight?

Factory-installed braces to secure them? Not so much.

"I've got the most brilliant idea! Instead of people driving on wheels, why don't we just make the roads themselves out of tires! Brilliant!"

I certainly wouldn't want to trail this guy for too far.