2016 Airstream Interstate Grand Tour EXT Twin, 2016 Airstream Interstate Grand Tour EXT Twin Bringing the best qualities of the classic Airstream travel trailer to the popular Interstate touring coach series, the Grand Tour is built with a focus on long-term adventures for two.A new floor plan, introduced in 2016 Grand Tour models, offers a pair of twin beds. Both Grand Tour floor plans feature a larger galley than the Interstate Lounge, with additional counter space, multi-functional storage areas, a flexible workspace desk, and an over-sized fridge and freezer. Perfect for long road trips.