From what I understand is that if you are operating under a CPL (loaded gun anywhere inside the vehicle) you MUST disclose.
It doesn't matter if the gun is in the trunk, glove box, your pocket or on your hip.
If it's loaded
youmusthave a CPL and you would be operating under that CPL and you must disclose.
If pulled over by LEO for any reason or stopped in any official manner even if you are riding in the back seat of a car AND you have a loaded pistol, you must disclose.
DO NOT YELL "I HAVE A GUN"
Nicely state that you're a CPL holder.
Most likely the LEO will then ask if you are in-fact carrying at that time. Tell him. Most likely he/she (LEO) will just say "Ok, leave it there". That should be the end ofit unless you were driving like a total moron or drag racing or something like that.
If the gun is in "transportation mode"
(unloaded,encased,unaccessible) there is no obligation to disclose.
If you have a CPL, your instructor should have went over ALL of this with you already.