I miss the days of bench seats and saddle blanket seat covers. It was not even in a truck, but in a '74 Buick Le Sabre. I had a saddle blanket seat cover with a gun pocket under my knees. I could discreetly carry a 12 ga autoloader with a 30 inch barrel, or a scoped rifle. I usually had one or the other in the car.
This one appears to be fairly discrete.