Thanks for the responses- it's nice to know there are others with that in mind.

I've tried to think of scenarios that would force a bug-out situation, and have come up with this list:

Destruction of home: fire, flood, gas leak, some sort of weirdness like a vehicle crashing into our house and rendering it unstable, sewer backup (ick).

Aside from that, I find it hard to think of a situation that may force us to leave. I'm in a residential area. Our neighborhood is fairly tight, and appears to have quite a number of ham operators.