Get Lowest Price

New 2026 Forest River RV RiverStone 421FK

Fifth Wheel

Stock #T0005366

Superstore Caldwell

LEGACY PACKAGE WITH FULL BODY PAINT!

1 of 161

26 Riverstone 421FK 2026 Riverstone 421FK

+161

SALE PRICE: $164,995
MSRP: $228,948
SAVINGS: $63,953

Payments From: $1,338 /mo.

Sleeps 4
6 Slides
Front Kitchen

Kitchen Island

44ft Long
18,786 lbs
COCOA BEAN-RIPPLEBROOK

See All Specs

Specifications

Sleeps	4	Slides	6
Length	44 ft	Ext Width	8 ft 6 in
Ext Height	13 ft 4 in	Interior Color	COCOA BEAN-RIPPLEBROOK
Exterior Color	FROST	Hitch Weight	3635 lbs
GVWR	24000 lbs	Dry Weight	18786 lbs
Cargo Capacity	5214 lbs	Fresh Water Capacity	79 gals
Grey Water Capacity	120 gals	Black Water Capacity	40 gals
Tire Size	17.5"	Furnace BTU	40000 btu
Generator	5.5 ONAN MARQUIS GOLD	Available Beds	King
Refrigerator Type	French Door with Ice Maker	Refrigerator Size	18 cu ft
Convection Cooking	Yes	Cooktop Burners	4
Number of Awnings	2	Axle Weight	8000 lbs
LP Tank Capacity	40 lbs	Water Heater Type	Truma Aqua Go Comfort On Demand
AC BTU	30000 btu	TV Info	LR 65" Samsung LED Smart TV, BR 40" Smart LED TV
Awning Info	16' Electric with LED Lights	Axle Count	2
Washer/Dryer Available	Yes	Number of LP Tanks	2
Shower Type	Standard	Electrical Service	50 amp
Solar Wattage	600 watts	VIN	4X4FRS839T0005366

Description

Forest River RiverStone fifth wheel 421FK highlights:

Kitchen Island
Front Kitchen
Theater Seats
Dual Vanity Sink
Stackable Washer and Dryer

You will feel right at home in this fifth wheel! The rear private bedroom has a 72" x 80" king bed slide for a good night's rest, a rear large wardrobe with the washer and dryer next to it, and even a dresser with a 40" LED TV. And two can get ready at once in the full bathroom with the dual sink vanity. You can then head to either the desk slide to get some work done or whip up some scrambled eggs on the three burner cooktop at the island in the front kitchen. The kitchen even has a dishwasher for easy clean up and two bar stools at the high top dinette that overlooks the middle living area. Relax each night in true comfort on either the E-Z Glide sofa bed slide or the theater seating across from the entertainment center which has a fireplace and 65" Samsung LED Smart TV to watch your favorite movies!

The Forest River RiverStone fifth wheels and toy haulers are luxurious units that have it all! You'll find an automatic six-point hydraulic level-up system to keep your unit in place, and there is preparation for a four-camera observation system. The TravlFi Journey XTR 4G/LTE router and WiFi extender will help you stay connected to the outside world, and you'll never have to overpack again since the Splendid “Astral” stackable washer and dryer will let you clean the small amount of clothes you've brought with you. Another high luxury is the Fischer Paykal dishwasher which will allow you to spend more time enjoying your camp life and less time cleaning up. Each unit is built with a LCI Road Armour suspension system, dual-pane frameless windows, a full docking station, a 200W solar panel, and a BMPro touch control system.

PLEASE NOTE: GENERIC IMAGES AND/OR GENERIC DESCRIPTIONS ABOUT UPGRADES MAY BE USED AND MAY NOT FULLY REPRESENT THE ACTUAL TRAILER. FOR THE MOST ACCURATE INFORMATION AND PHOTOS, PLEASE CONTACT US DIRECTLY.

Options:

MAX GRAPHICS PACKAGE W/PAINTED CAPS
LUXURY PACKAGE
ULTIMATE ELECTRONICS PACKAGE
LEGACY PACKAGE W/PREMIUM FULL BODY PAINT: 100AH LITHIUM BATTERY, 3RD HIGH PERFORMANCE AC W/HEAT PUMP, HYDRAULIC DISK BRAKES, ADDITIONAL 400W OF SOLAR PANELS, LCI WASTE MASTER SYSTEM
PREMIUM PACKAGE: HELUX COILED PIN BOX, 4 CAMERA SYSTEM, SLIDE ROOM AWNING TOPPERS W/ METAL WEATHER SHIELDS, OUTSIDE TV, STARLINK STD KIT
5.5 ONAN MARQUIS GOLD GENERATOR

Features

Standard Features (2026)

Standard Interior Package

3.7 CF 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”x80” Standard
Vinyl Flooring in Slideouts
Day/Night Roller Shades Throughout
5200 BTU Fireplace in Living Room
Solid Surface Sink Covers
Overhead Storage Cabinets in Main Level Living Room
Sofa/Desk Slides
Residential Soft Close Hinges on Cabinet Doors
Soft Close Drawer Glides
Hardwood Dovetail Glides
Under-bed Storage Compartment
Solid Surface Backsplash

Standard Exterior Package

Batten Insulation in Side Walls, Slideouts, Ceiling, and Floors
3/8" Roof Decking
Fiberglass Roof
17.5" H-Rated Cooper 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 419RD, 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
Rivited Fenders

RiverStone Luxury Package (Mandatory)

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" 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)

Garage Model Standards

Triple 7,000 lb. Axles
66" x 80" Residential 10" Memory Foam Mattress
MORryde Zero Gravity Ramp Door
110" Deep, 64" Wide, 82" Tall (Bed up position) 58" Tall (Bed down position) Cargo Area (42FSKG)

Ultimate Electronics Package (Mandatory)

65" Samsung LED Smart TV in Living Room (39RKFB, 421FK, 42FSKG)
50-55" Samsung LED Smart TV in Living Room (425FO, 44DBL, 442MC Models)
Klipsch Premium Sound Bar
2,000W Inverter
BMPro Touch Control System
200W Solar Panel with 50Amp MPPT Controller
Pre-Wire Prep for Two Additional Solar Panels

Optional Legacy Package

Full Body Paint
Hydraulic Disc Brakes
3rd High Performance AC w/ Heat Pump
400W Additional Solar 100AH Lithium Battery
LCI Waste Management System

Additional Options

3rd A/C (15,000BTU) with Heat Pump
5.5 Onan Marquis Gold LP Generator
Cadet Wall Mounted Electric Heater in Bedroom
Trail Air 21K Hitch (39RKFB)
Furrion Four Camera System with 7" 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
50" SMART Outside TV (42FSKG only)
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

See us for a complete list of features and available options!

All standard features and specifications are subject to change.

All warranty info is typically reserved for new units and is subject to specific terms and conditions. See us for more details.

Due to the current environment, our features and options are subject to change due to material availability.

Favorite RVs

Save your favorite RVs as you browse. Begin with this one!

Greg Hagood was great to work with
Greg Hagood was great to work with as his knowledge and professionalism was excellent . I would recommend him and Happy Camper as the place to shop and by your RV

Kerry
Thank you
Just purchased a brand new Flagstaff from these wonderful people brought it home plugged it in and then the fireplace heater immediately popped and went off so I had it replaced took about a week 10 days to get this done a lot quicker than I thought it would considering they had to order the parts and

Roger
Thanks to the whole crew
Our experience purchasing a used fifth wheel could not have been better. Everyone was friendly and went out of their way to answer questions about the unit and provide solutions to logistic challenges to complete the trade/purchase. Jason Currey went out of his way on days off and multiple phone calls

Doug

We are here to help, call us at
208-466-6250 or Contact Us

We are here to help!

208-466-6250
Contact Us
Get Lowest Price

Happy Camper RV Sales is 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 @208-658-8300 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.

Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. Where an image has a stock image indicator, please confirm specific unit details with your dealer representative.

New 2026 Forest River RV RiverStone 421FK

421FK Floorplan

Specifications

Description

Features