Sounds like your halfshaft. Apparently can break if you hit something hard enough (ex. pothole). Easy fix for Rivian. Unfortunately, appears to be a common problem. Had mine fixed just back in April, was too scared to drive it (caused regen to disable) so had it towed to Rivian, which they...
For my R1S, last winter I bought the following from Tire Rack with Discount Tire doing the install, as I did with multiple Teslas before without any issues (this is my 4th EV). Tires were great in snow, but yes there is a 20+ hit on range. That's why I stick to EVs with ~400 range.
Rims...