The 2021 Keystone Alpine 3790FK is a truly exceptional luxury fifth wheel, setting a high bar for residential comfort, innovative design, and robust construction. As a flagship model in Keystone's prestigious Alpine line, the 3790FK floor plan is a standout, featuring a unique and highly sought-after front kitchen layout that maximizes living space and provides an unparalleled at-home experience for full-time RV living or extended, high-end travel.

If you're searching for a late-model used fifth wheel that combines cutting-edge features, an incredibly spacious layout, and a focus on residential amenities, the 2021 Keystone Alpine 3790FK is an outstanding choice in the pre-owned RV market.

2021 Keystone Alpine 3790FK Specifications: Explore This Premier Front Kitchen Fifth Wheel

Overview & Key Features:

• Innovative Front Kitchen (3790FK): The "FK" denotes its signature feature: a dedicated front kitchen layout. This design utilizes the very front of the fifth wheel for a massive, U-shaped kitchen with extensive counter space, residential appliances, and often large panoramic windows, creating a bright and highly functional culinary hub. This is a dream kitchen for RV cooking.
• Massive 5-Slide-Out Design: This model typically features an impressive five slide-outs, dramatically expanding the kitchen, living area, and master bedroom, creating an incredibly open, spacious, and residential feel throughout. This maximizes fifth wheel interior space.
• Mid-Coach Master Bedroom: Features a private mid-coach master bedroom with a comfortable king-size bed (often 70" x 80"), ensuring a restful night's sleep.
• Residential Amenities: Designed with home-like features throughout, from high-end appliances to luxurious finishes and furniture, for ultimate comfort on the road.
• Four-Season Capable: Keystone Alpine's robust construction includes superior insulation (tested for extreme temperatures) and comprehensive heating systems for comfortable extended-season RVing, often branded as "Four Season Living".

Dimensions & Weights:

• Exterior Length: Approximately 41 ft 4 in. This makes it a substantial large fifth wheel for serious travelers.
• Exterior Width: 8 ft 4 in (100 inches). This wide-body construction provides even more interior space.
• Exterior Height: 13 ft 5 in.
• Hitch Weight: Approximately 2,905 lbs.
• Dry Weight (UVW): Approximately 14,140 lbs.
• Cargo Carrying Capacity (CCC): Approximately 2,860 lbs.
• GVWR (Gross Vehicle Weight Rating): 17,000 lbs.
• Axle Count: 2 axles (often heavy-duty 7,000 lb axles, providing robust support for heavy loads).
• Tire Size: 17.5" H-rated tires (for superior load capacity and durability).

Tank Capacities: Prepared for Extended Living & Boondocking

• Fresh Water Capacity: 66 gallons (generous for longer stays and boondocking).
• Grey Water Capacity: 78 gallons (large capacity for extensive use, often split into two tanks).
• Black Water Capacity: 39 gallons.
• LP Tank Capacity: 60 lbs (two 30lb tanks / 14.2 gallons).
• Water Heater Type: 12-gallon Gas/Electric DSI (or On-Demand Tankless Water Heater as a premium upgrade for continuous hot water).

Appliances & Utilities: High-End Comforts with Smart Functionality

• Refrigerator: 18 cu ft Residential French Door Refrigerator with Ice Maker (standard for this model, a key feature for full-time RV kitchens).
• Cooking: 3-burner High-Output Range with 22" Oven. 30" Over-the-Range Convection Microwave.
• Furnace BTU: 35,000 BTU High Capacity Furnace.
• AC BTU: Dual 15,000 BTU Whisper Quiet A/C units with heat pumps (total 30,000 BTU cooling, often with an optional third 15k BTU AC for maximum cooling power).
• Electrical Service: 50 Amp service with detachable power cord and power cord reel.
• Generator Prep: Often prepped for an onboard generator.
• Inverter: 2,000-watt Pure Sine Wave Inverter (powers residential fridge and select outlets, essential for off-grid power).
• Awnings: Dual Power Patio Awnings with LED lighting.
• Entertainment: Large LED Smart TV in Living Area (often 50-65 inches on power lift). LED TV in Master Bedroom. Home Theater Stereo System with Bluetooth. Electric Fireplace (adds ambiance and supplemental heat).
• Washer/Dryer Prep: Standard prep for stackable washer/dryer units.
• Central Vacuum System (often standard or optional).

Construction & Exterior: Alpine's Renowned Quality and Durability

• Construction: Heavy Duty 12" I-Beam Chassis. Laminated Aluminum Framed Construction for walls, roof, and floors. Steel reinforced upper deck.

• Insulation: Four Season Living Package provides superior insulation (often R-11 walls, R-38 floor, R-38 roof) and heated and enclosed underbelly with 12V tank heaters for true four-season RVing.

• Roof: One-Piece TPO Roof with 12-Year Warranty.

• Exterior Finish: High-gloss fiberglass exterior with automotive paint finish on front cap. Aerodynamic front cap with Max Turn Technology for improved turning radius.

• Towing & Suspension: MORryde SRE 4000 Suspension (or optional MORryde Independent Suspension System) for a smoother ride.

• Heavy-Duty 7,000 lb Dexter Axles with self-adjusting brakes.

• 6-Point Hydraulic Auto-Leveling System (essential for quick, effortless, and stable setup).

• Road Armor suspension for reduced chucking.

• Backup camera prep. Solar prep.

• Storage: Massive amount of pass-through storage with slam-latch baggage doors and magnetic holdbacks.

• Exterior Features: Universal Docking Station, Outside Shower, SolidStep Quad Entry Steps.

Interior Features: Residential Comfort and Smart Design

• Flooring: High-quality residential vinyl flooring and carpet (in select areas).
• Cabinetry: Hand-Rubbed Hardwood Cabinetry. Solid Surface Countertops throughout. Large pantry.
• Front Kitchen: U-shaped kitchen with residential stainless steel sink, pull-down faucet, and ample storage.
• Living Area: Power theater seating with heat and massage. Tri-fold hide-a-bed sofa. Free-standing dinette with chairs. Roller shades throughout. Residential LED lighting.
• Bedroom: Mid-coach master bedroom with King Bed (or Queen option). Large wardrobe. Under-bed storage.
• Bathroom: Full master bathroom with a spacious walk-in shower (often with a seat and skylight), porcelain toilet, and large vanity.
• Technology: iN-Command Pro Series RV automation system with touch screen and phone app control. USB charging ports throughout.