This is a pretty handy link:
http://www.handgunlaw.us/documents/USRVCarCarry.pdf
I have traveled extensively with guns in years past (moves, etc.). P4L is right: Unloaded guns in a secure, locked container are simply not an issue as long as they are separate from the ammo.
If you need a driver to ferry out the second car and the guns, I could be persuaded
