The U.S. government began imposing additional 25 percent tariffs on medium- and heavy-duty trucks and their parts on Saturday, bringing the total tariffs on such vehicles to 50 percent.The measure, which the White House says is meant "to bolster American industry and protect national security," applies to some trucks imported from Japan, possibly affecting Japanese companies making commercial-use automobiles.Until now, the United States basically imposed a 25 percent tariff on medium- and heavy-duty trucks, and a 2 percent duty on buses. The proclamation signed by President Donald Trump on …READ FULL ARTICLE