Different spring rates, front and rear?

[Manderthal]

Does anyone do this for crawling? Why or why not?
FMS FCX24 K5 Blazer (sort of tame crawler build).
The weight bias seems to favor the rear as it sags slightly.
My theory is that if I change the spring rates to slightly stiffer rear / softer front, the truck might handle better and be more capable on low speed, uneven terrain. Shocks are Injora 45mm oil filled.
It's just an idea. What do you think?

 

[nino]

Of course, normal thing on crawlers... But weight really should be forward biased for good performance.