Brian....you are onto something!!!!!
I like the first one, but a few changes:
1) Instead of "SoCal", go ahead and expand it out like you did in the 2nd one and have it read Southern California
2) Put a small amount of white between the "red cross" and the "H" so that it's not connected to it...but jjjjjjust underneath it!
These such stickers could stave off vandal attacks, tickets from cops and get us some respect!
I see you didn't include your first version, which was "SoCal HUMMERS emergency response team, show us your t
ts!"