tonyh wrote:
Sorry to correct you but a sledge does not spread the weight. It concentrates it on a smaller area. IE.. The runners..
Not necessarily. Something similar to a log raft with a flattened underside might be two or three times wider than the stone and would reduce the ground pressure by a proportional amount.Tony
I'm not saying that's how they did it, only that there are ways to solve problems that should not be dismissed out of hand.