Well, I bought one and here's my story...
Installation: When I ordered the seat for my 20RM 2884559-VBA (Classic Seat Black), it was done under the assumption that the proper harness was in the kit to make it work with Ride Command II, as in show up in the display when in use. I Installed it without instructions as the website states that the instructions were included in the box. They weren't and I couldn't find them at that time anywhere. The Rogue seat had instructions so I used those hoping it was going to be similar. The harness included was 2415866 which is a 4 (seat) to 2 (bike) connector. As a student of electronics I was wondering at the time 'How do the bike know?' about the seat as it seems all I was doing with that connector was using it for power. I imagined the power and magic of CANBUS would make it show up......it didn't.

So back to the dealer with a 'What's up with this?' question. At that point the answer was it's supposed to work.
Well, I had a service coming up and asked them to check on why the seat wasn't communicating to Ride Command II. When I came to collect the bike, they had since found out that it needed another connector harness 2415332 (Harness-Under Seat H/C V3) and that they had ordered it for me. I picked it up today and Lo and Behold, it now shows up.
Review: In the dealer's defense, they had contacted Indian before I ordered that seat and they said everything was included with the seat kit. Of course, since then, they found out otherwise. I have not done more than about 20 miles in one sitting on the seat since I bought it as the weather has not been as cooperative as I would like. However, those 20 miles were fine and no issues as far as seating goes. Not much of a test but that's all I got.
I have attached the instructions to install the seat kit that I have since found on the Polaris website. Interestingly enough when I filter with my RM, it says it doesn't fit the bike....
So the moral of this story is that if you have a 20+ RM with Ride Command II, you really need harness 2415332. I should have taken a picture of that but all it is, is the large cable that plugs into the cable coming from the bike to the back of the bike with a 4 pin connector for the seat itself.