Made-in-China oil supertankers are set to be slapped with more hefty charges under America’s latest proposal to penalize ships manufactured in the Asian nation as the trade war between Washington and Beijing rages on. China-made supertankers sailing under non-Chinese owners or operators can expect to be hit with a surcharge of nearly $1.9 million upon calling at a US port under the new rules, according to estimates by the research arm of Arrow Shipbroking Group. The sum balloons to $5.2 million for any China-owned or -operated ships, the firm said in an April 18 note.