Do you have a truck/trunk gun? What & why that?

If you arent comfortable sharing, I understand and appreciate you. If you are comfortable, what and why that?

I'll go first:
(what) a Mossy 88 pump 12g with an 18" bbl, a heat shield with the usual accessories ie. Weapon light, sling and 8 round ammo holder, double aught.

(why)
(1) deterrance value ~ Nothing screams deterrance like racking a 12g.

(2) close range effectiveness ~ Nothing is as effective in the limited distance of 2-3 car lengths as double aught.