Yeah, we worked ourselves to the bone last summer! It took multiple trips with 2 semi trucks, one with a crane, and 2 gooseneck flat bed trailers to get all those tires to our field. Then several more days with a tractor to put 'em in place. That doesn't even count the fort building, spool placing, and brush clearing we did.
It's much more fun to play on though!
Edit: We're near some coal mines. Most of those tires are from huge coal mining trucks and are much, much heavier than tractor tires. That's why it took the crane on one of our trucks to get the heaviest of them loaded.