Rivian (RIVN 0.51%) recently reached a long-held goal in its development. It is producing its electric trucks at scale. Building a factory from the ground up to support a new vehicle brand was a huge task, and Rivian pulled it off with a sustainable annual production of around 50,000 vehicles.But that achievement is in no way the final goal. That said, in a year, Rivian is likely to be another step closer to the long-term goal of becoming a sustainably profitable company.Production was the first step for Ri ...