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My truck gun is a Benelli Nova with ghost ring sights with 00 buckshot loaded and Brenneke slugs in a butt cuff.

IMO/IME none of the firearms mentioned in this thread so far will reliably stop a vehicle, which is my primary requirement for a truck gun.

Handguns, pistol caliber carbines, .223/5.56, .30 Carbine, .30-30, .300 BLK, etc. will penetrate windshields and autobody panels, but either the bullets disintergrate during penetration, don't have a whole lot of retained energy left after penetration, or use round nose bullets that have an increased chance of ricochet and deflection. The hard cast, square shouldered Brenneke Slug does a better job of penetrating car parts with less chance of ricochet or disintergration. An African Big Game Rifle in the .375 to .458 range would be another good choice for a truck gun, but they are expensive to purchase and to shoot, have a smaller magazine capacity, and have a much slower rate of fire than a pump or semiauto shotgun.

Just my .02,
LeonCarr