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IIRC the only three options (2011 anyway) that were not available on the R/T were the heated steering wheel, cooled (NAPA) seats, and the blind spot detection. I might have missed one but I think thats it.
I have not followed what options are available for the 12's or 13's but it sounds like 11 was the best year for options on the RT. Mine was fully loaded, HEMI, AWD, leather, heated seats, adaptive cruise/ forward collision warning, tow, rear DVD, 730N, performance tires and sunroof.