A device for securing a rear seat within a cab of a vehicle, comprising a crossmember configured for attachment to a floor pan of the vehicle, the crossmember cooperating with the floor pan to provide a cavity for storing items within the cab. When the crossmember is attached to the floor pan and the rear seat is attached to the crossmember, the crossmember is contained within the space between the seat and the floor pan without extending into a passenger leg room area.