You shouldn't even need email addresses. Use a PM feature with email notification that the recipient has a PM. That way the only thing revealed on the website is internet handle vice real name.

You might also consider putting out the PM to an area code/zip code/meet-up spot registry. That could result in more than one responder which would add to the security. Meeting places with video cameras would add to security (Las Vegas would be easy). That said, if a vehicle is disabled, getting it to a fixed meet-up point may not be possible.

All this pre-supposes access to the internet to access the registry; is that realistic?

Edit: On a related note, I got in touch with a member from another forum in the area here and we became pretty good friends. Since I work near his home, it's a place to hang if we ever have that big earthquake here in SOCAL while I'm at work. I really recommend making contact with members in your area early rather than waiting for a crisis to force contact.