Hey there, this was my unit in Afghanistan '05-'06! You have done an amazing job, right down to the boxes of liter water in the back! You might be interested to know that ours was the only unit in the country to have that paint scheme. It was pretty unauthorized, but our platoon sergeant at the time pretty much did what he wanted, haha.
To answer your question, common kit in the truck was a couple of ammo cans for the MK19 strapped to a rack centered on the rear wall, maybe a ruck sack in one of the rear footwells, the driver's M4 sitting somewhere, an open ammo can in the center console, centered on the radio mount, that we used for extra ammo mags, M67 grenades, smoke grenades, etc.
Also, what would it cost for you to make one just like this for a few of us who are interested? Thanks, and I hope the info helps!