I guess gun trucks are better than nothing, but sure would like to see some more Armor in Iraq. Also did some tests, when I was in the military. To seperate fact, supposition and fiction from reality. 3/16" sheet steel, won´t stop a rifle round (7.62 MM), with any regularity.
Personally I´d retrofit some old M-60 tanks, with quad fifties or better yet a 20 MM chain gun. Tank is really the only thing that has a chance of surviving a decent size mine, IED, RPG, crew serve mortor or a 14.5 MM gun.
We ran road security with the old M-60, worked well and cost a whole lot less than an M-1. One M-1 has about the same price tag, as a platoon of M-60´s (Isreal still uses them).
Saw an M-60 run over a 500 lb. bomb set up as a mine, crew survived.