DHL is hiring hundreds of customs experts to help businesses navigate unprecedented trade turbulence that is upending supply chains even as the integrated logistics giant expects a more muted peak shipping season this fall. A barrage of constantly changing U.S. tariff policies has whipsawed freight markets, with shippers fast-forwarding overseas orders to beat tariff deadlines, then reducing imports because inventories are high, and looking to find suppliers outside China — where average U.S. tariffs are ...