Oil companies planning to ship crude on the expanded Trans Mountain pipeline in Canada are concerned that the project may not begin full service on May 1 but they would be nevertheless obligated to pay tolls from that date. In a letter to the Canada Energy Regulator (CER), Suncor Energy and other shippers including BP and Marathon Petroleum have expressed doubts that Trans Mountain will start full service on May 1, as previously communicated, Reuters reports. Trans Mountain Corporation, the government-owned entity that completed the…