Directly from the Old Man Emu product catalogue.According to Ryan at ARB, the #2949 are rated at 400lbs; do you have info that states different? If so, I need to call him back and clarify; I've got the #2949 on order...
Fwiw, the heaviest rate springs I have on my list are ome2996 at 250lbs/in, which is already unusually heavy compared to most of what is available.