2016 Keystone RV Alpine 3730FB, 2016 Keystone Alpine 3730FB, Fifth Wheel, Ivy League Decor 2016 Keystone RV Alpine 3730FB Alpine is the first new-generation luxury fifth wheel. Designed for the customer who demands a new level of quality, convenience, and features unimaginable just a few years ago. Alpine was engineered from the frame up to to be a generation ahead of anything else in the market today.