Arent there some states that prohibit this even with a permit?.
Some states consider vehicle carry "concealed", therefore a "permit" is required, as in Washington. No worries, we follow the law. I do not know of a State that does not allow vehicle carry at all.
I put my pistol in the holster as soon as I get out of bed. At he end of the day, when I get back in that bed, I take it off. I always know where it is, I always know it is loaded, I always know that I have the means to defend myself.
I keep my doors locked because I live in the woods, in a park. Very beautiful, but the whole bloody world walks past my house. Some are not friendly. Please do not burst thru my door. It will not matter who you are, gang banger(we have quite a few), LEO(knock w/warrent), it does not matter. We have planned for it, we have practiced it, we restock the supplies needed to combat it. You will not be successful trying a HI at my location. You will be met with guns, dogs, sharp things, and chemicals. You will not be successful.
Defense of ones Home and Hearth is in your genes. That does not mean that it will come naturally. You may have to cultivate it. Do not wait until it happens to formulate a plan. Strategically placed tools and
a plan are needed as well as practice. Your mileage may vary.
Be safe, be prepared. First step would be a handgun, in a holster, at your side.