In a move that could further strain its relationship with the United Auto Workers (UAW,) Stellantis NV (NYSE:STLA) is planning to expand its production of Ram trucks in Mexico. What Happened: The automotive giant, which also owns Jeep, Dodge, and Chrysler, is set to expand its factory complex in northern Mexico to manufacture Ram 1500 pickup trucks, reported The Wall Street Journal on Tuesday, citing people familiar with the matter. This move could potentially exacerbate the already strained relationship between the company and the UAW. The company has been producing most of its light-duty Ram…