My $.02
I think "hard" seats in a "rock crawler" are a bad idea at best, and dangerous at worst...
I think its all about trade-offs.
I will openly admit that its true....racecars that are normally involved in the "worst" wrecks ALL run rigid seats....BUT..
1...."most" of their big impacts are not up/down parrallel w/ the spine...and,
2....when they do get far enough off the ground for a hard straight down impact....they're having other issues and at that point its all about "survival" not comfort/minimizing injury....hence all the Hans devices, window nets, center head-catcher nets, etc....surviving a spinal injury is better than being dead. Some of the wrecks they see, a suspension seat may indead be worse due to the "can only get the belts 'so' tight" issue of a suspension seat.
In an 'offroad' rig.....there are alot of high impact straight down events.....I don't care how well belted in you are, how many Hans devices and window nets you have, you'll be pissing blood for a week after desert race in a Kirky seat...
AND....this becomes more obvious in moon buggys in competition...
all the breakover obsticles that have become popular in comps have shown this.....you break over something hard......and it doesn't matter what tires/shocks/bumps you've got, your
rock-->steel-->seat-->ass
didn't somebody in a moon buggy actually get 'kinda' hurt from exactly that last season?
sure, they're harder to fit, but 'stingers' up my spine scare the **** outta me...
--B