Charlie,
First of all, welcome to the RV forum. Feel free to ask questions, participate in discussions or offer advice on whatever your expertise is.
Second, congratulations to you and your wife on going full-time. My wife and I are still a few years away, but we hope to do the same thing after retiring. I know you will have many great adventures full-timing in your RV.
Third, I second what Ray D wrote to you in his response. Not everyone thinks you should NEVER carry a gun under ANY circumstances. That is their opinion, which they are entitled to, but not everyone feels that way. If you and your wife are more comfortable carrying a handgun with you on your travels, then by all means do so. But, as others have said, be sure you do it safely and in accordance with the laws of our land. The safety part comes from what you said you would do, and that is to get properly trained and licenced to carry a handgun and then practice with it as often as possible. The legal part comes from knowing what the individual state laws are concerning carrying a hadgun in your travels. The book that Gary mentioned and the links that Ray D provided are excellent sources to research that information, and I urge you to look at all of those sources.
Again, welcome, congratulations, and happy travels!
Dan