Working down town brings up a couple other points too. Although I think sheltering in place is probably the best idea for most situations, you should practice several different ways out of town during rush hour to see how they work with crowded streets (arent they always) and to allow for different main streets to be closed in the case of a disaster. Another idea, weather feasable for you or not I don't know, might be to keep a bicycle in your truck, for in the event of a mass evacuation that would probably get you out of town faster.
Another thing I've added to my kit recently is a dust mask and goggles. You could use one of your bandanas as an improvised mask, but I decided that the benefit of having dedicated protection outweighed the cost.

for what it's worth,
Chris.