Economists are projecting strong U.S. imports during the summer-fall peak season. The ports took a big hit in the first two months of the year as cargo was diverted to the East Coast and Canada. Alphaliner reported that trans-Pacific carriers this summer will introduce six new all-water services from Asia to the East Coast.West Coast ports face the same supply chain challenges that all U.S. ports must contend with.Exporters in the heartland experience a shortage of containers, chassis, intermodal rail equipment and truck capacity. Some ocean carriers limit their export bookings because of capacity issues, or they “roll” export shipments to subsequent voyages.