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Johnston RV Center

2026 Forest River Sandpiper 3990FL

2026 Forest River 2026 Forest River Sandpiper - image 1
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Layout & Media

Explore the floorplan, 3D tour
2026 Forest River Sandpiper 3990FL floorplan

Complete Fifth Wheel Specifications

2026 Forest River Sandpiper Overview

Introducing the 2026 Forest River Sandpiper 3990FL, a remarkable new addition to the fifth-wheel category that offers ample space for family adventures, sleeping up to 8 people comfortably. With a length of 43.5 ft and a dry weight of 12,439 lbs, this model is designed for easy towing and maneuverability. Enjoy modern amenities including a powerful 30,000 BTU air conditioning system and a spacious bathroom with a standard shower. Ideal for those seeking a blend of comfort and adventure, the Sandpiper is a great choice for your next getaway. Schedule your tour today!

Premium Features & Highlights

Sleeps 8 for Family-Friendly Travel
43.5 ft Length for Spacious Living
30,000 BTU Air Conditioning for Year-Round Comfort
40,000 BTU Heater for Warmth in Cold Weather
12V Stainless Steel Refrigerator for Modern Convenience
Select a category to view specs

Overview

Vehicle Identification & Details

8 specifications available

Category
Fifth Wheel
Condition
new
Floorplan
3990FL
Make
Forest River
Model
Sandpiper
Stock Number
SP-048862
VIN
4X4FSAS24TJ048862
Year
2026

Size & Weight

Dimensions, Weight, Construction & Exterior

8 specifications available

Dry Weight
12,439 lbs
GVWR
15,375 lbs
Length
43.5 ft
Width
8 ft
Awnings Count
1
Doors Count
1
Primary Color
White
Slides
5

Sleeping & Layout

Beds, Layout, Living & Comfort

10 specifications available

Bunk Beds Count
0
Convertible Beds Count
0
Double Beds Count
0
Full Beds Count
0
King Beds Count
0
Queen Beds Count
0
Sleeps
8
Has Primary Bedroom Window Shades
Yes
Recliners Count
0
Sofas Count
0

Kitchen & Dining

Cooking, Dining & Appliances

3 specifications available

Microwave
Yes
Stovetop Burners
3
Refrigerator Type
12V Stainless

Bathroom & Facilities

Comfort & Privacy

4 specifications available

Bathrooms Count
1
Has Bathroom Vent
Yes
Has Medicine Cabinet
Yes
Shower Type
Shower w/Seat

Water Systems

Tanks & Plumbing

8 specifications available

Black Water Capacity
50 gal
Black Water Tanks Count
1
Fresh Water Capacity
50 gal
Fresh Water Tanks Count
1
Gray Water Capacity
80
Gray Water Tanks Count
1
Has Water Heater Bypass
Yes
Water Heater Type
On Demand Tankless

Power & Electrical

Electrical, Entertainment & Safety

9 specifications available

Ac Prewiring
Yes
Cable Prewiring
Yes
Has Battery Converter
Yes
Heat Prewiring
Yes
Satellite Prewiring
Yes
Tv Antenna Prewiring
Yes
Washer Dryer Prewiring
Yes
Radios Count
0
Televisions Count
0

Climate Control

Heating & Cooling

2 specifications available

Ac Btu
30,000 BTU
Heater Btu
40,000 BTU

* Vehicle specifications listed to the best of our knowledge. All specifications, features, and information are provided by the manufacturer. Johnston RV Center is not responsible for manufacturer defects, specification changes, or recalls. Buyers should verify all information directly with Johnston RV Center.

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Built to Last

Superior construction for years of adventures
Plumbing

50-Gallon Black Water Capacity

Designed for extended trips with ample waste storage.

Plumbing

50-Gallon Fresh Water Capacity

Sufficient water supply for longer journeys.

Ready for Your Next Adventure?

Experience the freedom of the open road with your next RV adventure

Payment Calculator

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from $536/mo
Estimated • 20% down

Schedule Tour

See this RV in person at our showroom

Showroom Hours
Mon-Fri: 9AM-6PM
3504 Deere Rd. SE Decatur, AL 35603

Trade-In Value

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Trade Evaluation

Dealer assessment

Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. We are 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 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.
$74,605
est $499/mo