German automaker Daimler AG plans to build Mercedes Benz-branded heavy trucks in China by revamping truck plants owned by its local joint venture. The plan will deepen the alliance between Daimler and its Chinese truck JV partner, Beiqi Foton, and comes after the purchase of a 5 percent stake in Daimler last month by its Mercedes Benz passenger car partner, Beijing Automotive (BAIC), Foton's parent group.