In NH, I beleive your plate is run along with the check. Basically the LEO already knows You Carry (in the System). Have'nt been stopped.......yet, since I've carried. IF and when I do, I will keep My hands on the steering wheel across from each other. When the officer asks for Lic. and Reg. I will inform them THEN that I have a LTC. Then and there I will wait for their instruction/s. Me personally wouldn't give a speach as far as...........
"Officer, I understand you go through a lot of risk in your line of duty, I would like to minimize this risk and inform you that I am in possession of a Concealed Weapon permit and I do have the weapon on my person (or in the car) The weapon is on my left hip (or next to the emergency brake handle in the center console). My license and registration are in my left front pocket. How would you like to proceed?". Or anything similiar. I would still inform them whatever Rank.
In MA., I'm not 100% sure. I hear different answers (unless someone on here can actually clarify), but I would still inform the Officer that I indeed have a LTC. As mentioned on here, if You are not breaking the law, then You should not have a problem. If I do get an "uneducated" officer then I guess I'll have too deal with their ego. In the end I know I did everything correct and will deal with it later. (meaning, if I got arrested etc.)
As long as You're not breaking the law, just smile
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(All the above are MY opinions/suggestions ONLY....AND, I like to bust ball's, it's called having a sense of humor. In other words, no intent to offend anyone, so get over it)