Kerry, I have a pair of those on the rear of my 4Runner and they seem to work well. The real problem with the Fuso seems to be lack of travel. The Deaver springs seem to have several advantages. They use more, but thinner, leaves. They also use Teflon pads between the leaves for less stiction. They will build them with pretty much any arch/amount of axle travel that you want. I'm just trying to decide the best compromise between ride and handling. That, and a pair of Bilsteins should make a huge difference.
Earl