This is the highly sought after Montana 376FL21! Yes this has the rear master with the 2nd level above. Purchased new and only camped in it a handful of times. It is Anderson Hitch ready with lots of added goodies. A 2 inch lift was added along with all 4 slide-out covers done in black (a must). Also professionally welded 2 rollers to the back of the frame. The rollers with the lift allows this 5th wheel to go practically anywhere. It also has solar panels!!! Still has stickers on the outside, you will not be disappointed, perfect condition.

You can see the floor plan of the newest model at this link. It's almost identical to the one listed for sale.
https://www.keystonerv.com/product/montana-high-country/luxury-fifth-wheels/floorplans/377FL