Across America's freight corridors, a quiet reckoning is underway. Diesel fuel has crossed six dollars a gallon in nearly every state, and the trucking companies that move the nation's goods find themselves bound by contracts written in a cheaper era — unable to pass the burden forward, forced instead to absorb it mile by mile. It is a story as old as commerce itself: the moment when a promise made in one world must be kept in another, and the distance between the two is measured in vanishing margins.