I think read somewhere (N4W I believe) that when Steve was considering Xterra SAS, he was thinking spring under axle to keep it somewhat streetable so as to be more appealing to larger market. My feeling is that the same logic would be carried over as much as possible to the coil sprung SAS kit and that he would strive for good on-road performance (hence as little as 4" lift). I guess I'm thinking of the landrovers & landcruisers (late models) that had coil-sprung solid front axles & a pretty good ride as well...granted not with 35's & 6" of lift; but the point is there may be enough flexibility to dial in, at least to some extent, your own preferred compromise of onroad vs. offroad performance.