Tundra. What could be better than the powerful full-size Tundra? More of it. Introducing the new Tundra Double Cab. The biggest truck we've ever built. Now with four full-size doors, its huge interior gives you and your four passengers ample leg, shoulder and head room. Still, if your crew has been working hard, you may need to drop the first-in-class power vertical sliding rear window for maximum flow-through ventilation.