Are you referring to the Indian Standard for Ready Mix Concrete?
As per the
Indian Standard IS: 4926 – 1976 (re-affirmed 1999) RMC is defined as
"Concrete delivered at site or into the purchaser's vehicle in a
plastic condition and required no further treatment before being placed
in the position in which it is to set and harden".
Gosh... ! Did you ever saw the kind of suspension those puppys have ? It's does look like an 'Air Boots' ? or probably 'Hydraulics' ?, who know's? A combination probably I guess, It's seing more like an 'Air Suspensions' to me, I don't know.. Clarify Me There if Possible Please... Nice Day All Now...