The spring rate of the non-AHC springs is quite a bit over King springs. A few months back I had LX OEM springs, King springs, OEM LC springs and OME "heavy" springs all in the garage at the same time. The change in spring rate is something like this:
LX OEM
.
King Springs
.
.
.
.
.
Non-AHC OEM
.
OME "Heavy" springs
There's a BIG jump from King to non-AHC springs. I'm sure non-AHC springs will work fine for a rig with a steel rear bumper and a cargo system, but short of that I think it's overkill.