The Costco guy mentioned Costco would not install sensors not bought from Costco. Maybe I gave up tire warranty so the guy didn't mind to install the sensors or I was lucky enough that they didn't have Rivian sensors at that moment.
Are you sure RDE232V26 is too long for ram 2363 wheel? I had same config but bought X-Ice from Costco. Costco guy helped me to mount tires and sensors onto the wheels, and didn't complain anything about its length. The RDE232V26 sensors were bought from Amazon...
20" MSW Wheel, the wheel we are talking about.. See load rating in page 2. https://www.rivianforums.com/forum/threads/20-msw-wheel-now-available-at-tire-rack.21068/page-2#post-431296
The load index of 2535 lbs is 113, while my R1S tire has 116 index. It seems the wheel load index is way lower than R1S tire. I am wondering if it's a good choice.