I think something is wrong with your figures?  You state "and ONLY 416 Posts (answers)" to Class A topics.   Only 416 Answers?  If you look just under the posting of Let Me Know if You Have Allison Transmission Fluid Questions, there are 238 answers there.
You may be right on less Class A owners work on them.  I think part of this is because for a lot of people they're harder to bring home - meaning to have a place large enough to park them while working on them.  And just going by storage places in the general Phoenix area, I think more Class A owners store them someplace besides where they live, then fly in to use them - snowbirds.
Can't say I've seen one group being more social than the other.
Bill