Isn’t there is something called the “Wingspan Rule” that applies to vehicle situations?
Geographic scope limitation exception to the search warrant requirement: the person and the areas into which he could reach in order to procure a weapon or destroy evidence = “wingspan rule”. SC said in 1991 (Belton) when a person is validly arrested in a car their wingspan includes the entire interior compartment of the car and everything in but not the trunk of the car.