All of the relevant factors are listed by state, including which states have reciprocity agreements with others. Passage of the national reciprocity act would make that point moot, like drivers' licenses. They are ALL recognized by ALL states. No questions asked. Why not the same for concealed carry permits you might ask? Well, the fact that most non-gun owners are uneducated in gun ownership, civil rights and the fact that regardless of the desire on many people's part that guns just disappear or be banned outright, criminals and bad people will get, carry and use guns. Like it is somehow morally superior to be found dead - shot, strangled, stabbed, bludgeoned, etc. - rather than to have to explain to the police how that person who attacked you got those bullet holes in his chest.
So, with that in mind, I put my road carry package together, suitable for many hours in the car, and for many hours in the company of hundreds, and in some cases, thousands of people who mostly do not carry guns, mostly don't like or understand guns, and who would likely freak out if they saw or suspected that someone amongst them were actually carrying a gun. Sort of like normal life, but on an amplified scale for a couple of weeks.
Being a person who understands risk analyis and is often a fan of redundant systems, I elected to take two Rugers: an LCP and an LC9. This would provide me another weapon should one become unuseable for any reason, like a malfunction of me leaving it behind somewhere (not very likely, but, hey, I've done stupid things before...) This would also permit me to balance firepower with conditions, like around the hotel room it's more comfortable to carry the little LCP than the bigger, heavier nine. With Hornady Critical Defense ammo, the LCP would be effective, especially within the confines of a hotel room, and worse case, would possibly buy me some time to get to the nine of things really went to hell in a hurry. At least that was the theory.
For holsters, I took two Versacarry rigs. Either would fit either gun and provide varying levels of deep carry. I also took a standard Remora for the LCP and two Remoras for the LC9, one tuckable, the other not. Lastly, I took the Uncle George back pocket holster for the LCP.
I used a combination of them all at one time or another. Except for the Uncle George, most of my carry positions were either appendix or cross-draw. When in situations where one is sitting, moving about, sitting, etc. throughout the day, I favor the cross-draw position. Good concealment and easy to get to, even when wearing a seat belt. You have to get a suitable holster though, since the end of the grip may tend to protrude under your shirt. I found that the Remora or the Versacarry worked fine in this position too.
When all was over and we were back home, I got an unintended compliment from my wife. She looked at me (I was carrying the LC9 in a Remora at the time) and asked, "Did you carry your gun while we were at the reunion?"
"What do you think?" I said.
"I don't know," she said, "did you?"
I haven't answered that question yet.