RS stands for "Refuse Special"...means it was probably originally in a garbage truck. Allison changes the HP/Torque ratings based on intended usage.
If you look at page 56 in this catalog it shows the different designations
http://www.chrysalis-tr.com/pdf/2011...alog_FINAL.pdf
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2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.
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