Chassis & Towing
24,000 lbs GVWR
Robust towing capacity for larger loads and stability on the road.
2026 Forest River RiverStone 421FK
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Layout & Media
Explore the floorplan, 3D tour
Complete Fifth Wheel Specifications
2026 Forest River RiverStone Overview
The 2026 Forest River RiverStone 421FK is designed for luxury and comfort, boasting a spacious layout that sleeps 4. At 44 ft in length and a dry weight of 18,786 lbs, this new fifth wheel offers an incredible experience on the road, perfect for family adventures or weekend getaways. Enjoy the convenience of a kitchen island and multiple slides to enhance your living space. With a fresh water capacity of 79 gallons and rear bathroom location, you have everything you need for longer trips. Schedule your tour today!
Premium Features & Highlights
Spacious Interior Layout
79-Gallon Fresh Water Capacity
6 Slide-Outs for Expanded Living Space
Kitchen Island for Enhanced Cooking Experience
Solar Ready for Off-Grid Capabilities
Select a category to view specs
Overview
Vehicle Identification & Details
8 specifications available
- Category
- Fifth Wheel
- Condition
- new
- Floorplan
- 421FK
- Make
- Forest River
- Model
- RiverStone
- Stock Number
- RS91
- VIN
- 4X4FRS834T0005243
- Year
- 2026
Size & Weight
Dimensions, Weight, Construction & Exterior
9 specifications available
- Dry Weight
- 18,786 lbs
- GVWR
- 24,000 lbs
- Length
- 44 ft
- Exterior Height
- 13.33 ft
- Width
- 8.5 ft
- Awning Length Ft
- 16 ft
- Awnings Count
- 2
- Slides
- 6
- Hitch Weight
- 3,635 lbs
Sleeping & Layout
Beds, Layout, Living & Comfort
8 specifications available
- Bedroom Count
- 1
- King Beds Count
- 1
- Primary Bedroom Location
- Rear
- Murphy Beds Count
- 0
- Sleeps
- 4
- Fireplace
- true
- Interior Lighting
- LED
- U Shaped Dinette
- false
Kitchen & Dining
Cooking, Dining & Appliances
3 specifications available
- Kitchen Island
- Yes
- Kitchen Location
- Front
- Washer Dryer Prep
- Yes
Bathroom & Facilities
Comfort & Privacy
2 specifications available
- Bathroom Location
- Rear
- Shower Type
- Standard
Water Systems
Tanks & Plumbing
3 specifications available
- Black Water Capacity
- 40 gal
- Fresh Water Capacity
- 79 gal
- Gray Water Capacity
- 120
Power & Electrical
Electrical, Entertainment & Safety
2 specifications available
- Solar Ready
- Yes
- Washer Dryer Prewiring
- Yes
Climate Control
Heating & Cooling
2 specifications available
- Ac Btu
- 15,000 BTU
- Heater Btu
- 40,000 BTU
Standard Features & Equipment
Generator
Dual-Pane Windows
3rd A/C (15,000BTU) with Heat Pump, 5.5 Onan Marquis Gold LP Generator, Cadet Wall Mounted Electric Heater in Bedroom, Furrion Four Camera System with Monitor Screen—Rear, Side and Main Entry Door Views, Slide Room Awning Toppers with Metal Weather Shields, Two Additional 200W Solar Panels, MORryde Independent Suspension System, Hydraulic Disc Brakes, 40" SMART Outside TV, Queen Bed Suite IPO King Bed Suite, 2nd Sofa IPO Desk (39RKFB, 42FSKG, 421FK), Ceramic Coating, Additional Lithium Batteries (up to 4 Total), Starlink Kit IPO TravlFI, Trail Air 21K Hitch (39RKFB), 50" SMART Outside TV (42FSKG only),
Triple 7,000 lb. Axles, 66" x 80" Residential-Style 10" Memory Foam Mattress (Super Queen), MORryde Zero Gravity Ramp Door, 110" Deep, 64" Wide, 82" Tall (Bed up position) 58" Tall (Bed down position) Cargo Area (42FSKG),
Full Body Paint, Hydraulic Disc Brakes, 3rd High Performance AC w/ Heat Pump, 400W Additional Solar 100AH Lithium Battery, LCI Waste Management System,
Batten Insulation in Side Walls, Slideouts, Ceiling, and Floors, 3/8" Roof Decking, Fiberglass Roof, 17.5" H-Rated Tires with Aluminum Rims, Hydraulic Slideouts on Main Level and Bed Slides, Electric Awning with LED Lights, Side Turning Lights, LCI Road Armour Suspension System, 3" Hung Glass Exterior Walls with High Gloss Gel Coat Exterior, Tandem 8,000 lb. Axles / 7,000 lb. Tri-Axles, 32" x 78" Entry Door with Friction Hinges, Dual Pane Frameless Windows, 12v Heated Full Docking Station, Two 15,000 BTU High Performance Quiet Cool A/Cs with Heat Pumps, 12V Powered 50 Amp Cord Reel, Painted Full Front and Rear Fiberglass Caps (N/A 42FSKG, 421FK, 425FO – front caps only), MORryde Entry Step at Main Door, MORryde Safe-T-Rail, Water Manifold System, Composite Slideout Floors, Two Dual 6V or 12V Slide-Out Battery Trays, High Visibility Chrome LED Tail Lights, 2" Hitch Receiver for Bike Rack (300 lb. rating. N/A in Toy Hauler Models), Dual 40 lb. LP Tanks, Electric Dump Valves, Riveted Skirt Metal,
3.7 CU. FT. oven with 4-burner range, Upgraded Calcutta Solid Surface Countertop in Kitchen, Large Stainless Steel Kitchen Sinks with Residential-Style Faucet, 18 CU. FT. French Door Refrigerator with Ice Maker, Vinyl Flooring, LED Lighting Throughout, 30" Stainless Steel Microwave with Convection, Oval Porcelain Toilet with Foot Flush, Cordless Vacuum, 40,000 BTU Furnace, 10" Thick Memory Foam Mattress 72" x 80" Standard, Vinyl Flooring in Slideouts, Day/Night Roller Shades Throughout, 5,200 BTU Fireplace in Living Room, Solid Surface Sink Covers, Overhead Storage Cabinets in Main Level Living Room, Sofa/Desk Slides, Residential-Style Soft Close Hinges on Cabinet Doors, Soft Close Drawer Glides, Hardwood Dovetail Drawers, Under-Bed Storage Compartment, Solid Surface Backsplash,
Automatic 6-Point Hydraulic Level-Up System, Four Camera Observation System Prep, TravlFi Journey XTR 4G/LTE Router & WiFi Extender, Splendide “Astral” Stackable Washer and Dryer, Stained or Painted Hardwood Cabinetry and Stiles Throughout, 40" SMART LED TV in Bedroom, 12V Heated Holding Tanks, Fisher & Paykel Dishwasher, Ceiling Fan (N/A on 425FO), Truma Aqua Go Comfort On-Demand Hot Water Heater, LP Generator Prep, BMPro Energy Management System, Tank Sensors Display (Grey, Black and Fresh) Integrated with BMPro Readout, Tire Pressure Sensors, Additional Campside Awning with Weathershield, Two Folding Chairs (N/A 421FK / 42FSKG),
65" Samsung LED Smart TV in Living Room (39RKFB, 42FSKG, 421FK), Klipsch Premium Sound Bar, 2,000W Inverter, BMPro Touch Control System, 200W Solar Panel with 50Amp MPPT Controller, Pre-Wire Prep for 2 Additional Solar Panels, 50-55" Samsung LED Smart TV in Living Room (425FO, 44DBL, 442MC Models),
* Vehicle specifications listed to the best of our knowledge. All specifications, features, and information are provided by the manufacturer. Fife RV Center is not responsible for manufacturer defects, specification changes, or recalls. Buyers should verify all information directly with Fife RV Center.
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Built to Last
Superior construction for years of adventures
Plumbing
40-Gallon Black Water Capacity
Efficient waste management for extended trips.
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from $1,078/mo
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Showroom Hours
Mon-Sat: 8:30 AM - 6 PM, Sun: 10 AM - 5 PM
3410 Pacific Hwy E Fife, WA 98424
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Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. We are not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales tax, registration tags, and delivery fees. Manufacturer pictures, specifications, and features may be used in place of actual units on our lot. Please contact us for availability as our inventory changes rapidly. All calculated payments are an estimate only and do not constitute a commitment that financing or a specific interest rate or term is available.
$151,249
est $1,078/mo