Rivian shared a couple of clips of an El Cap Granite R1S on their Instagram stories. Here's some screenshots I was able to take.

Automotive tail & brake light Vehicle registration plate Vehicle Car Automotive lighting

Tire Wheel Automotive tail & brake light Vehicle Window
Wheel Tire Automotive tail & brake light Vehicle Car
Tire Wheel Vehicle Window Automotive lighting
Wheel Tire Vehicle Car Hood
Vehicle Grey Automotive tire Font Automotive design
Vehicle Motor vehicle Communication Device Automotive design Gadget
Car Vehicle Automotive mirror Mode of transport Automotive lighting
Vehicle Car Sky Automotive lighting Plant
Vehicle Screenshot Font Personal luxury car Automotive design