Type = Fifth Wheels Year = 2014 Make = Keystone Model = Montana 3900FB Length = 40 Awnings = yes Slides = 3 Sleeps = 6 AirConditioner = 1 Seller Number: 740828. For sale by owner 2014 40 ft. Keystone Montana 3900FB w/3 slides. Immaculate condition Like brand new. Adult owned no children, pets or smoking. I have all the specs almost too much to list here. 3 slideouts, auto leveling, queen size ...