I posted about 100 pics of an MATV
here The pics were (obviously) taken between missions, so there's not much in the way of food, water, etc. When we rolled, we had ammo stored in the rack between the front seats, and kept a cooler and MREs strapped down on the gunner's platform (leaving room for the gunner of course). Everything was strapped down in case of a blast or rollover. We didn't keep an AT-4 inside the crew compartment, that's something the gunner would have up with him in the turret. We kept outside stowage to a minimum, since the Afghans would steal anything they could reach. Generally it was fuel, a stretcher, and cots if we were going out for more than a couple of days, all tied down very securely.
With 5 guys inside the vehicle for many hours, sometimes days, the interior was pretty trashed. Pop-Tarts, Rip-Its, power bars, beef jerkey, and slim jims, and lots and lots of water were the favorites. If you look at picture 32, you'll see a thin black wire coming from the bottom left of the main intercom control box; that's where we hooked up the ipod for music over the headsets....that was very important. Also, don't forget to have a yellow water bottle rolling around on the floor.

Chris