We
had a pretty good thread on this topic but I guess its gone?
All I can really offer is:
There is nothing in the Universe more useless than a vehicle with an automatic transmission and a dead starter. 
This doesn't mean everyone needs to buy an antique Jeep. The point is to
really look at your "worst case" plans, if you have any, and re-think them logically. Your plans should change over time to reflect your situation.
For example- what good is a home generator if you don't know how to run or maintain it? How would you get gasoline if the gas stations have lost power?
Stockpiling rice and pasta is worthless if you can't boil water just like canned foods are worthless without a manual can opener.
Instead of hunkering down, plan on how to move quickly. Being able to move quickly is worthless without an idea of
where to go. Remember that de-commissioned missile silos are prone to flooding.
Always plan for things to screw up. While we're on the subject, try to keep your plans as simple as possible.
Hunting for game is fine, but what are you going to do once you drop that buck or a cow? Having 200 pounds of meat is great until it starts to rot. Learn how to make do with less.
If you're spending 36 consecutive hours defending your compound from strangers-
YOU'VE ALREADY LOST.
How are your People Skills? Can you build a team if it means your life depends on it?