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While softer/harder rubber compounds are a fact, I don't ever recall seeing it labeled as such on the tires--only the wear ratings from the govt standards.
I can tell you from personal experience that 19.5s and 17.5s are 'harder rubber' than 20s/18s/17s/16s meant for driven vehicle use.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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