I remember that bill. It was effectively killed in commitee by Garton, who is now no longer @ the statehouse. This is the bill that eventually was mutated into the castle law. Don't get me wrong, castle laws are good, but it would be nice to not get fired for having a gun in your car (not much of an issue for me as I work in a state mandated "victim disarmament zone"). I think there was another bill in the statehouse this last session covering this, but it died a quiet death, as well.
Maybe another approach would be to get your automobile legally protected as an extention of your home? It would make sense that your employer can't search your house, so they shouldn't be able to search your vehicle if it's an extention of that. But, alas, I am not a lawyer.