Obviously, this ain't legal advice, but I can't imagine a state that would disallow having even a loaded long gun in your trunk. Unless the particular person had reasons to be disallowed from possession, obviously.
And, BTW, unless you are told by a cop, "You are under arrest," you are under no obligation to comply when an officer asks permission to search your vehicle. I, for one, would NEVER allow an officer to search my vehicle when I have an option.
So a loaded trunk monkey sounds fine in my book!
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face