FWIW, Moved across the US from Calif to CT and back to Calif (7 years later). The move to CT was at the company's expense and I 'packed' everything and 'ignored' the liability issues. On this leg I left the safe and bought a new one when I got to CT.
On the way back to California, a move at my expense, I moved my firearms, primers and powder in my POV. I did have my safe, non explosive reloading stuff and second vehicle moved by a moving company thus avoid the PIA of trying to move the safe myself.
On my way back to California, I aways backed my truck & camper against a wall to prevent folks 'shopping' at my expense.
Once on the trip, when I did not feel safe, I moved all firearms into the motel room.