I read, and follow the idea, that anything can be bartered, I can also use myself. I'm planning on the fact I have friends and relatives close by. If we need to trade back and forth, we can. If things get as bad as what it could, don't think a cross country trip, at least by vehicle, would be a good idea. Do as you please, but a running car/truck, makes a dandy target. Plus, I don't think the highways would be open for any lenght of distance. Could be, but I'm not going to be the one to find out differently.
Trying to think of any different situation that might arise, still come back holding tight. Food,water,companionship, all within walking distance. gypsyman