A huge rolling tractor tire gathers no moss, especially if you and a buddy are curled up inside going downhill. Kids, don’t do this at home without a safety helmet and a chase truck. Also, please remember Brazil is in the Southern Hemisphere, where everything is upside down and bass-ackwards. If you try this in the U.S., position the tire to roll uphill.
If you need to get the webbed skin between your thumb and index finger nailed to a wood plank in the backyard, make sure you do it like YouTube user buffoon114; call a professional with the proper tools, safety gear and mad carpentry skillz. (NSFW audio.)