In Texas on a traffic stop it is advisable if you are carrying to inform the officer. Also note that in Texas it is legal to carry concealed in your car, going from your home to your car, and going into and from your place of buisness without having a CHL. I just hand the officer my CHL on top of my drivers License. They notice it, and ask "do you have your gun on you." I respond with "yes it is (where ever it is) how would you like to proceed?"
So far every time was uneventful. None of them were harassing. Most oogled my guns. All of them seemed to drool over a couple of my guns. More than one local has come to the range to shoot some of mine when I invited them to come and shoot my guns on my dime.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.