My son called MSP and asked if his truck is parked for the required 10hrs off duty time and he is in his sleeper part of the truck, then they consider it his home or at least a room where he is resting and can have his pistol assembled in the truck otherwise it needs to be locked up in a safe and the ammo kept in a separate container according to federal law while he is in transit from one place to another. Same thing if he is parked and taking his 34hr required off duty time as well. He also has a copy of the federal law for transporting firearms as well. I think he asked for it in writing and they sent him a letter to his home of record to carry with him.
That would be rare. I thought only members of MSL could request opinions like that.