My rig sits unattended from October to late April. In the past, I only set the front jacks down after parking it with some wood pieces under the tires. With the Ground Control jacks I put on earlier this year, I'll probable drop the rears down, too, and raise it up a bit. Even so, I have not had a problem with the tires or suspension and keep the tires covered. Do make sure to inflate them to the maximum cold pressure rating, including the spare. Lubricate any manual jack mechanisms.
Use air to blow out the plumbing before adding the antifreeze and don't forget to dump some into the toilet tank and gray tanks, as well. Make sure anything remotely edible is removed, including your clothing (or vacuum seal it). Be sure to go around the rig and seal up any openings that don't need to be there with expanding foam. Home-made rubber gaskets around any slide piston rods work to close them up.
I don't leave my vents open while stored, but then I'm not worried about a large heat build-up either. Close all the window blinds to cut down on the sun load on the interior and remove any electronics that aren't nailed down. Put a sign outside that you've removed the TV and stereo and maybe the crooks will pass your rig by (no guarantee on that).
Might also be a good thing to get your wheel bearings repacked before you leave.
Good luck on your deployment and stay safe. Keep an eye out for wacky Iraqi's or angry Afghans. And don't pick up any empty pop cans along the road to get the deposit.