Just a reminder, the R2 does not come with air suspension. So most likely it will not come with an on board compressor. Their goal is to keep the cost down. No extras if not needed.
The latest video shows the tow hitch mounted to the frame. It is definitely a 2 inch receiver. Even though I don't tow that often, I'm glad to see that Rivian has included a tow hitch from the factory. Here is a snap shot from the video.
As for my guess on the towing capacity it will be 6000...