Stop me if you have heard this before; Rivian, a start-up electric automaker is planning to reinvent the various vehicle segments it plans to enter. But unlike most start-ups, Rivian hasn't dropped any sort of vaporware in the form of concepts or teasers. Instead, the company has been quietly working on a production-ready model that will be debuting later this week at the LA Auto Show. This is the R1T, a futuristic-looking electric pickup truck. The front end features a unibrow-like central