Unit Specs
- Stock #15247
- Year2026
- ManufacturerForest River
- Make Forest River
- ModelSandpiper
- Floorplan3990FL
- Type Fifth Wheel
- ConditionNew
- Length43' 6"
- VIN4X4FSAS22TJ049122
- Price $79,999.00
- 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
Looking to buy a 2026 Forest River Sandpiper Fifth Wheel RV?
Make memories together as a family with this 2026 Forest River Sandpiper 3990FL! By owning this 2026 Forest River Sandpiper 3990FL, you’re joining the Forest River family! 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
Dimensions
Height
13' 4"
Length
43' 6"
Width
8' 0"
Weights
Dry Weight
12,439 lbs
GVWR
15,375 lbs
Hitch Weight
2,825 lbs
Payload Capacity
2,936 lbs
Capacities
Refrigerator Capacity
16 cu ft
Sleep Capacity
8
Water Capacity - Black
50 gal
Water Capacity - Fresh
50 gal
Water Capacity - Grey
80 gal
Exterior
# Awnings
1
# Axles
2
# Doors
1
# Slides
5
Hitch
Fifth Wheel
Electrical
# A/C
2
A/C Spec
15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
2026 Forest River Sandpiper Owners Manual 1
Call:
800-949-8271
Stock #: 15247
Dealer Info
![Gillette's Interstate RV]()
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 $79,999.00
- 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
Looking to buy a 2026 Forest River Sandpiper Fifth Wheel RV?
Email Dealer
Request More Info on this 2026 Forest River Sandpiper 3990FL Offered for sale by Gillette's Interstate RV
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