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New 2024 Forest River RV Sandpiper 3990FL

Virtual Tour
2024 3990FL Features and Options

Forest River Sandpiper fifth wheel 3990FL highlights:

  • Shower with a Seat
  • Outside Storage
  • Theater Seating
  • Kitchen Island
  • Full and Half Loft


Wow! Check out this fifth wheel with a full loft for the little ones, plus a half loft that can become a play room/storage room. The main floor includes five slides for maximum space, a front living area with dual hide-a-bed sofas, plus an entertainment center with a 50" flat screen TV for movie nights! Once your guests have converted the living room to their bedroom at night, you can take the rear private bedroom. There is a king bed slide out here, plus a wardrobe, plus a closet with washer and dryer prep for full-time living. The full bath is easily accessible for everyone, and the middle kitchen will be a favorite with the chef of your group. Here, you'll find a 17 cu. ft. 12V refrigerator, an island, tons of counter space, plus a hutch to display nice dishes, and a pantry for dry goods. Don't let this fifth wheel slip away!


You will find the perfect balance of size, space, features, and luxury with any one of these Forest River Sandpiper fifth wheels! They are constructed with a welded aluminum framed vacuum bonded laminated superstructure, a cambered powder coated frame with rust prohibitor, and a fully enclosed underbelly to protect the units vitals during any season. The large tinted windows come with a 80/20 UV prohibitor or you can choose the optional dual pane windows. Some hassle-free amenities include a 60k BTU on-demand water heater, full coach water filter system, tire pressure monitor system, and an electric leveling system! Inside, you'll enjoy stainless steel appliances, solid surface countertops, upgraded raised panel cabinet doors, and rustic wood plank linoleum to name a few comforts!

What Our Customers Are Saying

Best RV Place in the Carolinas

We just purchased our first RV from Adventure and we were super pleased. Marcel was our sales representative and he was amazing. He was patient and let us look at all the choices they have. I have to say it was a fun experience the day we purchased our RV. We drove from NC but the quality of people here are worth it. Everyone was fantastic. Keith (the finance manger) was great and helped us decide - Steve from Asheville, NC
MSRP: $100,460
Discount: $27,177
Loan Amount: $73,283
Location: Greer, SC
Stock# 15285
2024 3990FL Specifications
Sleeps 9
Slides 5
Length 43 ft 6 in
Ext Width 8 ft
Ext Height 13 ft 4 in
Interior Color Tuscany
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 Stainless
Refrigerator Size 17 cu ft
Cooktop Burners 3
Number of Awnings 1
LP Tank Capacity 30 lbs
Water Heater Capacity 60000 gal
Water Heater Type On Demand Tankless
AC BTU 30000 btu
TV Info LR 50" Flat Screen TV
Awning Info 20' Electric with LED Light Strip
Axle Count 2
Number of LP Tanks 2
Shower Type Shower w/Seat
For more information, call us at 864-848-0098 or Contact Us
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Customer Satisfaction is Our #1 Priority.


At Forest River, Inc., your needs, interests, budget, and lifestyle are at the forefront of everything we do. This affects every step from design, to the manufacturing floor, and on to you, our Customer. Whatever your need—recreation, transportation, or cargo hauling—we strive to bring quality products within reach of everyone. It’s not just a slogan: “Customer Satisfaction is Our #1 Priority.”


In 1996, Forest River founder Peter Liegl had a vision. He foresaw an RV company dedicated to helping people experience the joy of the outdoors by building better recreational vehicles. After purchasing certain assets of Cobra Industries, the Company started manufacturing pop-up tent campers, travel trailers, fifth wheels and park models. Continually growing, Forest River now operates multiple manufacturing facilities throughout the United States producing Class A, B and C motorhomes, travel trailers, fifth wheels, toy haulers, pop-up tent campers, truck campers, park model trailers, destination trailers, cargo trailers, commercial vehicles, buses, pontoons, and mobile restroom trailers.


Our large production capacity enables us to fill our customers' orders promptly without cutting corners or rushing through production procedures. This ensures that each Forest River product is conscientiously built and undergoes thorough, detailed inspection before it's shipped to the customer. This guarantees that every family who desires quality recreation will find a Forest River product that serves their needs, interests, budget, and lifestyle. 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 @864-848-0098 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.