2014 Keystone RV Alpine 3620FL, 2014 Keystone RV Alpine 3620FL The Peak of Luxury and Innovation. 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. TraderOnline Ref# 119900361