DOUBLE CAB (car seats with a tray) It means that car seats built on the structure of the car pickup and pickup trucks belonging to the footer, which is open until the end of a vehicle without a roof, .
DOUBLE CAB (cars with a pickup) means that cars are built on the structure of the pickups. And the end of a pickup truck, which is open until the end of the car without a roof.
DOUBLE CAB (passenger cars with pick-up) means passenger cars built on the structure of the car truck. And the end is the pickup truck, which open to the trunk without roof .