Exclusivity defines truly special cars. It’s no secret that more discerning clients are often drawn to limited-run and bespoke vehicles such as Rivian’s early Launch Edition and more recent California Dune Edition models. But there’s another level of exclusive, a rarefied air that the young brand is entering thanks to the creation its first truly one-off vehicle: the R1S Quad Pebble Beach Edition. Based on the 2026 R1S SUV fitted with Rivian’s stupendous signature four-motor powertrain,...