Much is going to depend on where you are, as to your truck gun.
In Detroit, Atlanta, Soweto and JoBurg, a high capacity 9mm makes great sense.
In darkest Wyoming, or Kaintuck, not so much.

I am more likely to deal with a road injured moose than a home invasiion or carjacking.
And we just had another armed standoff.

Reality is, we have wolves, bears, moose and mountain lion right here.
And anything that can handle them can make a mess of a carjacker,but
the opposite is seldom true.

Were I only considering bad guys, my chiices would be different.
But I have to consider tooth, fang, and claw also.
It is effecting my choices and will continue to do so.