WARREN, Michigan — Hulking metal presses line one wall of Stellantis NV's cavernous stamping plant here, punching out the raw shapes of Jeep doors, Dodge hoods and Ram tailgates in rapid succession. Nearby, swinging yellow robots continue the tightly choreographed work, gluing and pressing and welding smaller components to the sheet metal that eventually will start to resemble the shape of a truck or SUV.