The 2016 Forest River Sierra 387MKOK CT is a wheel with a dry weight of approximately 13,797 lbs, a length of 41' 11", and five slide-outs. It features a double living room, 2 bathrooms. an outdoor kitchen, six-point hydraulic leveling, a central vacuum, and a 15,000 BTU air conditioner. 

Key specifications
* Type: Fifth Wheel
* Dry Weight: approximately 13,797 lbs
* Length: 41' 11"
* Number of Slideouts: 5
* Sleeps: 4
* Air Conditioning: 15,000 BTU
* Fresh Water Capacity: 60 gallons
* Gray Water Capacity: 130 gallons
* Black Water Capacity: 80 gallons 
* Hitch Weight 2537 lbs
Exterior features
* Outdoor kitchen with a microwave, refrigerator, and sink
* Ladder for roof access
* 50 amp hookup
* Pass-through storage
* Two-tone painted front cap
* Red LED accent lighting
* Electric awning
* Quad step entry
* Aluminum wheels
* Six-point hydraulic leveling 
Interior features
* Two living rooms
* 1 1/2 bathrooms
* Central vacuum
* Two air conditioners
* Kitchen dinette chairs
* Standard shower
* Standard television and DVD player 

Specs from online search of make and model numbers.