Here is a Livermore gun truck kit
From the looks of the trees in the background, and the driver/crew, I'm guessing this truck is not in theater?
Let me dig out some of my pics from OIF, and I'll post up the gun trucks that we had. They weren't nearly as pretty.
The most maneuverable and effective, direct fire vehicle for convoy escort on the main supply routes was the HMMWV with a .50 cal. mount. It could get to the problem quick, and it had speed. They flipped a lot. The MK-19 mounted, wasn't worth poo. At least not for our missions. We up-armored some 915-A1s that beat the crew half to death. Bob-tailed 915s are brutal. At one point, we built a "gun-trailer" that we pulled with a 915. It had fire-power, but you couldn't get anywhere in it. It was placed in the middle of the convoy for heavy fire/security when stopped for break-downs. The giant HETs hauling Bradleys up north with the crews inside were awesome! Especially when there was a string of them rolling through. Total coverage fire-power.