You must make plans as far as a meeting place incase of tornado's, fires, other causes. 

For know how to reach your significant other.

When communicating always find out these crucial things that may seem like nothing but in the end they all can help.

Where they are now?

Where they are going?

Have they ate, slept, or filled up with gas?

When do they estimate to be at final destination?

What is their truck #

If they have are pulling a van. What is the name on side of van cause many places drop and hook.

Most trucks have computers where the driver can be reached. But some don't. And there are things that can make it immpossible to contact them.  (Bad weather at times) or it broke.  So these little things help to give emergency personel an idea of where to start looking for them.