Rivian shared some updated info about the trailer hitch and receiver.
The R1T trailer hitch is there when you need it, and hidden when you don’t. A cover designed to improve aerodynamics comes off quickly by removing two retaining screws, revealing a 2'' Class V receiver rated for a 1,155 lbs. tongue weight. Trailer light and brake controls are provided via a 7-pin connector.
No matter what you’re towing, the R1T’s adaptive air suspension helps keep your truck level, even when pulling 11,000 pounds.