I asked the same question to a sales rep when I had my R1T in for a quick tire rotation and 7500 mile inspection and he said it's even more than 70/30 in my area (Northern Virginia). They sell about five R1Ss to every one R1T.
Called on Tuesday and made an appointment at the Glen Burnie, MD SC for a tire rotation and 7500 mile service. Gaithersburg is closer for me but the earliest appointment they had was late June. Thankfully, the Glen Burnie SC was able to get me in early next week even if it means an extra 30 min...