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New 2025 Forest River RV Sierra 3990FL

Fifth Wheel

Stock #SJ054083

Willow Street, PA

1 of 35

+35

Specifications

Sleeps	8	Slides	5
Length	43 ft 6 in	Ext Width	8 ft
Ext Height	13 ft 4 in	Interior Color	Switchback
Hitch Weight	2825 lbs	GVWR	15375 lbs
Dry Weight	12439 lbs	Cargo Capacity	2936 lbs
Fresh Water Capacity	50 gals	Grey Water Capacity	80 gals
Black Water Capacity	50 gals	Tire Size	16"
Furnace BTU	35000 btu	Available Beds	King
Refrigerator Type	12V	Refrigerator Size	16.8 cu ft
Cooktop Burners	3	Number of Awnings	1
LP Tank Capacity	30 lbs	Water Heater Capacity	60000 gal
Water Heater Type	On Demand	AC BTU	30000 btu
TV Info	LR 50" Flat Screen TV	Awning Info	16' Electric w/LED Light Strip
Axle Count	2	Washer/Dryer Available	Yes
Number of LP Tanks	2	Shower Type	Shower w/Seat
VIN	4X4FSES22SJ054083

Description

Forest River Sierra fifth wheel 3990FL highlights:

Full and Half Lofts
King Bed
Walk-In Shower
Front Living Area
Two Tri-Fold Hide-A-Beds
Theater Seating

The perfect fifth wheel for a larger family! This unit sleeps eight or more with the full and half lofts above the rear master bedroom and bathroom. In the full loft area there are two 44" x 74" bunk mats for comfort as well as wardrobe/storage at the head of each. The master bedroom features a king size bed that slides out to create more space by the bed. A spacious bath features a walk-in shower for comfort and includes a seat so you can relax while you shower. A spacious kitchen features two slides, a free standing dinette in one, and the 12V refrigerator and stove in the other. There is also a center island with large sink for added food prep space. Head up the steps in front to a dual slide front living area with 50" TV and fireplace beneath the window. There is also theater seating opposite the TV, and a tri-fold hide-a-bed in each slide allowing added sleeping space when needed.

Each one of these Forest River Sierra fifth wheels are equipped with everything you need to make the most of each adventure! The underbelly armor will protect your unit's vitals from road debris and the painted two tone aerodynamic fiberglass front cap has an improved turning radius to make them easier to navigate. With an electric leveling system, you can set your unit up quick and easy then get to having fun faster than ever. The welded aluminum framed, vacuum bonded laminated superstructure will hold up through every adventure and the cambered powder coated frame comes with rust prohibitor to last longer. Each model also includes the Summit Package that comes with a king Wi-Fi extender system and Olympus antenna, a full coach water filter system, Goodyear tires with 7,000 lb. axles, and the list goes on. The interior is just as impressive with rustic wood plank linoleum, recessed residential lighting, a memory foam mattress, and mocha accent crown molding over the kitchen cabinets!

Features

Standard Features (2025)

Exterior Features

Automatic Electric Level-Up System
2" Towing and Accessory Hitch (Where Available)
7,000lb axles with Anti-lock Braking System
Goodyear Radial Tires w/ anti-lock brakes
Lippert auto adjust brakes
GoPower 200W roof mounted solar panel with controller and battery
Quad MORryde® step above with strut (Where Available)
Color matched high gloss gel coated colored exterior fiberglass
Painted two tone aerodynamic fiberglass front cap with improved turning radius
Underbelly Armor
TST Tire Pressure Monitoring System
Enclosed and heated dump valves
16" Spare tire kit
Large tinted windows with 80/20 UV prohibitor
Electric awning with LED light strip
Prepped for Lippert On-The-Go Ladder
Power front jacks with spring loaded pins
Automotive-style fender skirts
Hitch light
Porch light with interior switch
30 lb. double LP tanks with auto change over
Rain gutters with extra long drip spouts (Prevents black streaking)
Insulated heavy duty slam lock baggage doors
Exterior foldable grab handle
Unobstructed pass through storage area
Upgraded aluminum rims
Oversized friction hinge entry door
Exterior LP Quick Connect with Grill/Griddle Cooktop

Interior Features

Solid Surface Kitchen Counter tops
Fiberglass one-piece shower with folding teak seat
Washer and Dryer Prep
6' 4" slide-out height
Stainless steel kitchen package
Beachside sundance linoleum
Hidden hinged, soft close drawers and cabinets
Full extension ball bearing drawer guides
Stainless steel under mounted kitchen sink
Trash receptacle in kitchen
Decorative backsplash
Two color coordinated interiors
LED lighting throughout
Recessed residential lighting
Accent lighting over dinette
Extra large, panoramic picture windows throughout
Vented side windows in slide-outs
TV antenna with booster
Solid wood drawer fronts with birch sides
Solid wood, square inset cabinet doors, painted or wood grain
Bedroom slide-out fascia
Memory foam mattress
Teddy Bear® bunk mats
50" flatscreen smart TV
JBL Aura Cube FM/Bluetooth media center
Designer window treatment
Ceiling fan
Tri-fold hide-a-bed sofa
Quilted bedspread

Appliances/Systems

Dual ducted 15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
17 cu. ft. 12V refrigerator
60,000BTU On Demand Tankless Water Heater
40,000BTU furnace
Heated Holding Tanks (12V)
Floor ducted 40,000BTU furnace
30" OTR stainless steel microwave
Chef collection 3 burner / 24" oven with drawers
Interior monitor panel for holding tanks
Satellite and cable hookup with RG-6 cable for high quality picture
Porcelain foot flush toilet(s)
65 Amp converter
Power fan in Kitchen and Bathroom(s)
Full coach water filtration system

Construction

Welded aluminum-framed, vacuum bonded laminated superstructure
5/8" tongue and groove plywood floor decking
2 x 3 floor joists, 12" on center
Laminated sidewalls
3/8" roof decking (Full walk-on roof)
Cambered powder coated frame with rust prohibitor
Underbelly armor
5" truss roof rafters
R-10, 2" sidewall construction
Laminated slide-out walls

For Your Safety

Smoke alarm
Fire extinguisher
Breakaway switch (Battery hook-up required)
Dead-bolt lock on entry door
LP/CO2 gas detector
Fire escape windows

Popular Options

Free Standing Dinette in place of Booth (3550BH only)
Two chairs in place of ottoman bench
Central vacuum
Slide room awnings (N/A dinette slides)
Washer and Dryer

Polar Tech Package (Optional)

Dual pane windows
3rd AC power saver direct dump system w/ wall thermostat

Summit Package

Electric Auto Leveling System
Goodyear Tires with 7,000 lb axles
2" Rear Receiver Hitch and 4-Pin Connector (Where Available) (NA 4002FB and 3990FL)
Two 15,000BTU Air Conditioners
Power fan in Kitchen and Bathroom(s)
Anti-lock Braking System
Tire Pressure Monitoring System
60,000BTU On Demand Tankless Water Heater
BoonDocker Solar System-200W Panel with controller & battery
MORryde Steps with Strut (Where Available)
Heated and Enclosed Holding Tanks (12V pads)
Washer and Dryer Prep
King Wi-Fi Extender System and Olympus Antenna
Underbelly Armor
Soft Close Residential Drawers & Cabinets Throughout
50" Flat Screen smart TV
4 Camera Security Prep with Back-Up Camera prep
Full Coach Water Filter System
Enclosed, One-Piece Docking Station
Color Matched Gel coated Fiberglass Exterior
Aerodynamic Two Tone Fiberglass Painted Front Cap with Lights
High Efficiency Radiant Foil (Roof and Floor)
Spare Tire

Chef's Kitchen Package

16 cu. ft. Stainless Refrigerator (12V)
Stainless Range with Cast Iron Grates
Solid Surface Countertops
Stainless Apron Sink with Strainer
Commercial Style Kitchen Faucet
30" Over-the-Range Stainless Microwave
Countertop Extension
Designer Backsplash

Please 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.

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New 2025 Forest River RV Sierra 3990FL

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New 2025 Forest River RV Sierra 3990FL

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