2016 Keystone RV Alpine 3660FL, Ask for John Pine for the best deal in town. Best internet pricing in the south west. No reasonable offer refused. 2016 Keystone RV Alpine 3660FL 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.