2012 Keystone RV Bullet 215RBS, Thermal package, power awning and jack,outside shower,DSI hot water heater 2012 Keystone RV Bullet 215RBS Easy to tow with the new more fuel efficient crossovers, cars and trucks, the Bullet Ultra Lite travel trailer heralds in a new generation of RVs. Sleek and smooth on the outside and loaded with features and conveniences inside, it will set you free to explore the open road.