unloaded Rifle behind the seat , mag in a pouch in the glove box.
Use your handgun ( assuming you have a CHL ) to dispatch the
first couple of Zombies , this will give you time to retrieve and load
your rifle before the main pack arrives.
OR , carry a Backup like mine.....

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-SIG , it's What's for Dinner-
know your rights!
http://www.handgunlaw.us
"If I walk in the woods, I feel much more comfortable carrying a gun. What if you meet a bear in the woods that's going to attack you? You shoot it."
{Bernhard Goetz}