2026 Forest River RiverStone 421FK

New Fifth Wheel in Mill Hall, Pennsylvania, 17751

$158,992.00

Photos (55)

Show All 55 Photos

New 2026 Forest River RiverStone 421FK available in Mill Hall, Pennsylvania

Floorplan of 2026 Forest River RiverStone 421FK

2026 RiverStone 421FK by Forest River from Bill's Happy Camper RV Sales in Mill Hall, Pennsylvania

Unit Specs

In Stock

Stock #005319
Year2026
ManufacturerForest River
Make Forest River
ModelRiverStone
Floorplan421FK
Type Fifth Wheel
ConditionNew
Length45' 0"
Width8' 6"
Height13' 4"
VIN4X4FRS830T0005319
MSRP $214,118.00
Price $158,992.00
Need to know your payment? Use our RV Loan Calculator!
Interior ColorSLUMBER SLOTH WOOD / CHOCOLATE FURNITURE
Exterior ColorMERCURY
Sleeps4
Water Capacity (Fresh)79 gal
Water Capacity (Black)40 gal
Water Capacity (Grey)120 gal
Air Conditioners3
A/C Spec15,000 BTU High Performance Quiet Cool A/Cs with Heat Pumps
Refrigerator Capacity18 ft³
Slideouts5
Payload Capacity5290 lbs
Dry Weight18,710 lbs
Tow/Hitch Weight3270 lbs
# Axles3

Looking to buy a 2026 Forest River RiverStone Fifth Wheel RV?

MERCURY FULL BODY PAINT

MAX GRAPHICS PACKAGE WITH PAINTED CAPS

RIVERSTONE LUXURY PACKAGE

ULTIMATE ELECTRONICS PACKAGE

LEGACY PACKAGE WITH PREMIUM FULL BODY PAINT - FULL BODY PAINT, 100AH LITHIUM BATTERY, 3RD HIGH PERFORMANCE A/C W/ HEAT PUMP, HYDRAULIC DISK BRAKES, ADDITIONAL 400 WATTS OF SOLAR PANELS, LCI WASTE MASTER SYSTEM

4 CAMERA SYSTEM W/ MONITOR

SLIDE ROOM AWNING TOPPERS W/ METAL WEATHER SHIELDS

39" OUTSIDE TV

Bill's Happy Camper RV Sales & Service is not responsible for any misprints, typos, or errors found on this page.

This 2026 Forest River RiverStone 421FK is the perfect rig for your adventures and explorations. By owning this 2026 Forest River RiverStone 421FK, you’re joining the Forest River family! If you’re looking for a family RV, you’ve found it: this rig sleeps 4. You won’t believe how big this RV feels with 5 slides. Entertain or cook up a cozy meal just for you in this RV kitchen equipped with the fridge, oven, stove. Even more RV memories will be made as you spend quality time hanging out on the theater seatingwatching a movie on the TV.. Comfort is important when RVing, and you’ll find just that with the king size bed. The heating option will keep your travels at the perfect temperature. If you’re thinking of heading off grid, this rig has a 79 fresh water tank. Outside, you’ll find automatic leveling jacks, awning, black tank flush, enclosed underbelly, external shower, heated underbelly, hitch, ladder, leveling jacks, pass thru storage, power awning, roof vent, screen door, second roof a/c, side view cameras, skylight, slam latch baggage doors, slideout, spare tire kit, thermal pane windows and tinted windows. Make sure kids don’t track mud inside with the outside shower. Store all the gear you need for your travels with the spacious pass-through storage underneath.

2026 Forest River RiverStone 421FK Features

Appliances
Convection Microwave, Dishwasher, Dryer, Enclosed Water Tank, Furnace, Heated Water Tank, Icemaker, Microwave, Oven, Refrigerator, Stove, Tankless Demand Gas Water Heater, Washer, Water Heater
Electrical
50 Amp Service, Air Conditioning, Converter, Inverter, Slide-out Battery Tray, Solar Panels
Equipment
Backup Camera, Bluetooth Stereo, Cable Prepped, Fire Extinguisher, Heat Pump, LED Lights, LP Detector, Propane, Smart TV, Smoke Detector, Sound Bar, TV, TV Antenna
Exterior
Automatic Leveling Jacks, Awning, Black Tank Flush, Enclosed Underbelly, External Shower, Heated Underbelly, Hitch, Ladder, Leveling Jacks, Pass Thru Storage, Power Awning, Roof Vent, Screen Door, Second Roof A/C, Side View Cameras, Skylight, Slam Latch Baggage Doors, Slideout, Spare Tire Kit, Thermal Pane Windows, Tinted Windows
Interior/Furnishings
Ceiling Fan, Day/Night Shades, Fireplace, Glass Shower Door, Island Kitchen, King Size Bed, Kitchen Sink, Medicine Cabinet, Overhead Cabinetry, Pantry, Shower, Solid Surface Countertops, Theater Seating, Toilet, Vanity, Wardrobe(s)

2026 Forest River RiverStone 421FK Specifications

Dimensions

Height

13' 4"

Length

45' 0"

Width

8' 6"

Weights

Dry Weight

18,331 lbs

GVWR

24,000 lbs

Hitch Weight

3,270 lbs

Payload Capacity

5,669 lbs

Capacities

Refrigerator Capacity

18 cu ft

Sleep Capacity

Water Capacity - Black

40 gal

Water Capacity - Fresh

79 gal

Water Capacity - Grey

120 gal

Exterior

# Awnings

# Axles

# Doors

# Slides

Hitch

Fifth Wheel

Electrical

# A/C

A/C Spec

15,000 BTU High Performance Quiet Cool A/Cs with Heat Pumps

*MFG Specs are for base unit. Certain options may change specifications listed. Please consult dealer for more details. Data is provided by a 3rd party. RVUSA.com cannot guarantee the accuracy of the data presented.