Unit Specs
- Stock #15247
- Year2026
- ManufacturerForest River
- Make Forest River
- ModelSandpiper
- Floorplan3990FL
- Type Fifth Wheel
- ConditionNew
- Length43' 6"
- VIN4X4FSAS22TJ049122
- Price $69,999.00
- Need to know your payment? Use our RV Loan Calculator!
- Sleeps8
- Water Capacity (Fresh)50 gal
- Water Capacity (Black)50 gal
- Water Capacity (Grey)80 gal
- Slideouts5
Enjoy your RV trips more than ever before in this 2026 Forest River Sandpiper 3990FL. Ready to be a proud Forest River owner? This 2026 Forest River Sandpiper 3990FL is the perfect fit. The sleep capacity allows you to bring up to 8 along on your travels in this rig. You won’t believe how big this RV feels with 5 slides. If you’re thinking of heading off grid, this rig has a 50 fresh water tank.
2026 Forest River Sandpiper 3990FL Features
2026 Forest River Sandpiper 3990FL Specifications
Height
13' 4"
Length
43' 6"
Width
8' 0"
Dry Weight
12,439 lbs
GVWR
15,375 lbs
Hitch Weight
2,825 lbs
Payload Capacity
2,936 lbs
Refrigerator Capacity
16 cu ft
Sleep Capacity
8
Water Capacity - Black
50 gal
Water Capacity - Fresh
50 gal
Water Capacity - Grey
80 gal
# Awnings
1
# Axles
2
# Doors
1
# Slides
5
Hitch
Fifth Wheel
# A/C
2
A/C Spec
15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
2026 Forest River Sandpiper Owners Manual 1
Gillette's Interstate RV
7210 East Saginaw Street
Haslett, MI 48823
Member Since 2009
See 370 ReviewsUnit Specs
- Stock #15247
- Year2026
- ManufacturerForest River
- Make Forest River
- ModelSandpiper
- Floorplan3990FL
- Type Fifth Wheel
- ConditionNew
- Length43' 6"
- VIN4X4FSAS22TJ049122
- Price $69,999.00
- Need to know your payment? Use our RV Loan Calculator!
- Sleeps8
- Water Capacity (Fresh)50 gal
- Water Capacity (Black)50 gal
- Water Capacity (Grey)80 gal
- Slideouts5
Email Dealer
Request More Info on this 2026 Forest River Sandpiper 3990FL Offered for sale by Gillette's Interstate RV
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