Maybe we are talking two different things, I was assuming you were thinking more rear "air springs" , their rate is based on fixed air chamber effective area, although some are have varying dimensions to allow some varying rate, and PSI, changing PSI which changes ride height when no other adjustments are made. Any conventional actual spring rates offered I can't comment on.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.