Rivian's stock is mired at a low level, but this EV maker could be on the cusp of an important inflection point. At this point, the company has a successful commercial product and a successful consumer product. On the commercial side, a partnership with Amazon helped to fund Rivian's early development efforts. And now the EV maker is looking to expand its commercial business, selling delivery trucks to more customers. The big news, however, is on the consumer side. After ramping up its production capacity, ...