One large tractor tire
Two truck tires with cable and pull harness
50 yards of asphalt
4 people willing to suffer
Put two in the tire pull harnesses and send them off to the mailbox while the other two alternate flipping and then jumping into and out of the tire. As soon as the pullers get to the mailbox, they dump the harnesses and switch places with the flippers. The old flippers now run the tires back to the start while the new flippers get the tire as far down the road as they can. They keep switching places until someone passes out, at which time only one tire would be pulled back and forth and the 3 would cycle thorugh each job one at a time, or until they get the big tire back to the starting point.