Ya gotta have water first, no matter what. And food. For security, you need both inside wherever you plunk yourself down for your last stand. And they've gotta last.

Or you divorce yourself from thinking about fortresses and fixed positions and focus on being able to go to what you need.

I'm going for the nomadic neo-barbarian horde. You run the risk of running out of fuel and spare parts, but as one set of resources is used up, at least you have some of the necessities in place to find more.

Ditch the cars and trucks and you become hunter/gatherers and start avoiding cities and concentrations of dead folks.

Horses, oxen and camels would be worth considering. Horseclans of the Living Dead, anyone? ;)

TZ
TexasZombie
http://www.geocities.com/eviloverlord668/afmain.htm
http://www.geocities.com/Area51/Vault/9327/main.html

That which does not destroy me has made a very grave tactical error...