I live in the city so I don't just casually throw a gun in the truck to go for a drive, it's usually a planned hunting trip with a good rifle or shotgun along.
BUT, on a summer black raspberry picking for example, up around Gatehouse's back yard, I've been known to have a Winchester '94 or even an M38 Swede on the seat of the truck in case I have to warn Mr. Blackie away.