Ace is correct. You really have to know what the situation is that you will be facing. What happened to cause you to leave and how long are you going to be gone. If you currently live in the country, on your own 20 acre farm or ranch, have a natural gas well and a generator, a years supply of MRE's 20 different guns, ammo, water, etc. Why leave unless it is a hurricane or some good reason to leave, then okay, but then where are you going? You can't drive 300 miles away and stay in a motel pulling a trailer full of guns and ammo. Of I guess you can but then you would have to sleep in the trailer to protect your property. Bottom line, your bug out gun is the gun you carry with you every ordinary day. The one you are used to and comfortable with. Hopefully it is a 40 or better and keep an ammo can in the trunk with as much ammo as you can fit in it and a small cleaning kit for it. On second thought, a good old .30 M1 Carbine in the truck would be a nice addition, especially for Zombies, but any good rifle with a high capacity magazine would do nicely. AK-47 would be a better choice than the M1 Carbine, but like someone said earlier, IT DO ATTRACT SOME STARES anytime you have it out in public where the 30 M1 only makes you look like a Antique Collector.