Name: 2026 Forest River Sandpiper 3990FL
Brand: Forest River
SKU: 46228
Price: 70999 USD
Availability: InStock

2026 Forest River Sandpiper 3990FL | RidesMarket

Vehicle Overview

Goodyear Radial Tires w/ anti-lock brakes
Lippert auto adjust brakes
Outdoor Kitchen
Remote Work Ready
Insulated heavy duty slam lock baggage doors
Oversized friction hinge entry door with extended latch (Main Entry)

From the dealer

Forest River Sandpiper 3990FL stands out with a GVWR of 15375 pounds and a length of 43.5 feet. Built with a robust chassis and premium interior finishes, it features a hitch weight of 2825 pounds and a dry weight of 12439 pounds. A generous capacity with Total Black Water Tank Capacity of 50 gallons and Total Gray Water Tank Capacity of 80 gallons ensures ready-to-go convenience, and hit the open road with confidence. View the Forest River Sandpiper at TerryTown RV.Read full dealer description

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This unit

$70,999

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Down payment

Estimated APR

Loan term

Estimated payment

$1,076/mo

$63,999 financed

Estimate only. Excludes taxes, title, registration, dealer fees, add-ons, insurance, and lender requirements. RidesMarket is not a lender.

Fifth Wheel Specifications

Length: 43.5
Sleeps: 9
Slides: 5
Dry Weight: 12439
GVWR: 15375
Fresh Water: 50
Grey Water: 80
Black Water: 50

Show 3 More Specifications

Height: 13.33
Width: 8

Features & Equipment

Equipment is supplied by the dealer. Confirm installed options on the dealer listing or window sticker.

Safety and driver assistance

Goodyear Radial Tires w/ anti-lock brakes
Lippert auto adjust brakes

Comfort and convenience

Outdoor Kitchen
Remote Work Ready
Insulated heavy duty slam lock baggage doors
Oversized friction hinge entry door with extended latch (Main Entry)
Solid wood, square inset cabinet doors, painted or wood grain
Memory Foam Mattress
Dual ducted 15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
Heated Holding Tanks (12V)

Additional equipment

Fireplace
Washer/Dryer Prep
Entertainment Center
Walk-In Closet
Power Awning
Pass-Through Storage
Free Standing Dinette
Loft
Family Friendly
Off-Grid Ready
Four-Season Comfort
Adventure Seeker
Luxury Travel
Full-Time Living
Automatic Electric Level-Up System
7,000lb axles with Anti-lock Braking System
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
Tire Pressure Monitoring System
Spare Tire
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)
Exterior foldable grab handle
Unobstructed pass-through storage area
Upgraded aluminum rims
Exterior LP Quick Connect
Solid Surface Kitchen Counter Tops
Fiberglass one-piece shower
Washer And Dryer Prep
7’ slide-out height (Main Slides)
Stainless steel kitchen package
Beachside Sundance Congoleum 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
50" flatscreen smart TV (65” 3900HBLR)
Designer window treatment
Ceiling Fan
Prepped for inverter
AIRDIRECT® Air Vents for improved efficiency
16 Cu. Ft. 12V Refrigerator
60,000BTU On Demand Tankless Water Heater
40,000BTU furnace
Floor ducted 40,000BTU furnace
30" OTR stainless steel microwave
Chef collection 3 burner / 24" oven with drawer
Interior monitor panel for holding tanks
Porcelain foot flush toilet(s)
65 Amp converter
Power fan in Kitchen and Bathroom(s)
5/8" tongue and groove DryMax® OSB floor decking
2 x 3 floor joists, 12" on center
Laminated Sidewalls
Cambered powder coated frame with rust prohibitor
R-10, 2" sidewall construction
Laminated slide-out walls
Smoke Alarm
Fire Extinguisher
Breakaway switch (Battery hook-up required)
LP/CO Gas Detector
Fire Escape Windows
Two chairs in place of ottoman bench
Cordless Vacuum
Slide room awnings (N/A dinette slides)
Washer and Dryer (Standard on 3800RK & 3900HBLR)
Dual pane windows (N/A 3900HBLR 84” Window)

2026 Forest River Sandpiper 3990FL

Vehicle Overview

From the dealer

Limited comparison inventory

Estimate a Payment

Fifth Wheel Specifications

Features & Equipment

Safety and driver assistance

Comfort and convenience

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Technology and audio

Capability and utility

Additional equipment