There are certain things I will always have on me unless prevented be law, keys, wallet, phone, tourniquet and Hemostatic gauze, a flashlight, a gun and a small fixed blade knife. My carry gun of choice is a Glock 19x, with RMR, x300u and Kkm barrel and comp. I really like the Shivworks clinch pick for a knife.
There a a few thoughts I have on vehicle carry.
First, try to avoided leaving firearms unattended in the vehicle. This is a major security risk. You truck is not a gun safe. If you want to bring long guns, on a trip, cool, bring them back inside when you get home. Crackheads will break windows for a lot less than a gun they can sell on the streets to feed there adiction.
Secondly, carry medical gear and get training on how to use it. If you carry a gun because your preparing for a deadly force encounter, be prepared to get hurt. The bad guy gets a vote too. You are also way more likely to need to stop major bleeding than justifiably use a firearm.