I say unless required by law you should not inform an officer about your gun UNLESS you believe it is likely he is going to notice it or about to notice it. If you have to get out of your car I would advise informing. Basically keep it on a need-to-know basis. I'm guessing though the officer already has a pretty good idea you are carrying if you have a LTCH.
As for your wallet if it is near your gun you probably should get the wallet out before he gets to the car. Don't worry about if he sees your moving around as a possible indication that you are up to something fishy. He still wont be able to search you or your car based on that. I'm also not sure if that would be enough for the officer to even require you to exit your vehicle. Not sure on the laws surrounding that order.
As for your wallet if it is near your gun you probably should get the wallet out before he gets to the car. Don't worry about if he sees your moving around as a possible indication that you are up to something fishy. He still wont be able to search you or your car based on that. I'm also not sure if that would be enough for the officer to even require you to exit your vehicle. Not sure on the laws surrounding that order.