Unit Specs
- Stock #FSI201
- Year2026
- ManufacturerForest River
- Make Forest River
- ModelSierra
- Floorplan4002FB
- Type Fifth Wheel
- ConditionNew
- Length521' 0"
- VIN4X4FSES28TJ055479
- MSRP $120,519.85
- Sale Price $84,994.00
- Need to know your payment? Use our RV Loan Calculator!
- Sleeps6
- Water Capacity (Fresh)50 gal
- Water Capacity (Black)100 gal
- Water Capacity (Grey)100 gal
- Slideouts4
- Payload Capacity15500 lbs
The 2026 Forest River Sierra 4002FB is a large, residential-style fifth wheel designed for families or multi-group travelers who want maximum space, privacy, and home-like comfort. With a unique two-bedroom, two-bathroom floorplan plus loft and four slide-outs, this unit delivers exceptional living space — making it ideal for extended stays or full-time living.
Highlights:
• Two Bedrooms + Loft with Dual Bathrooms featuring a front master suite, a second private bedroom with its own rear full bath and entry door, plus an overhead loft — perfect for families or guests
• Spacious Residential Living & Kitchen Area with a kitchen island, theater seating, fireplace, free-standing dinette, and large panoramic windows — creating a true home-on-wheels feel
• Built for Extended Stays & Comfort including 43’5” length, four slide-outs, dual A/C (prepped for 3rd), 16 cu. ft. refrigerator, tankless water heater, solar, and massive tank capacities (50/100/100 gallons)
Visit Giant RV today to explore the 2026 Forest River Sierra 4002FB — a fifth wheel built for family living, space, and residential comfort on the road.
View a video of this 2026 Forest River Sierra 4002FB RV on YouTube!
2026 Forest River Sierra 4002FB Features
2026 Forest River Sierra 4002FB Specifications
Height
13' 4"
Length
43' 5"
Width
8' 0"
Dry Weight
12,889 lbs
GVWR
15,500 lbs
Hitch Weight
2,340 lbs
Payload Capacity
2,611 lbs
Refrigerator Capacity
16 cu ft
Sleep Capacity
6
Water Capacity - Black
100 gal
Water Capacity - Fresh
50 gal
Water Capacity - Grey
100 gal
# Awnings
2
# Axles
2
# Doors
1
# Slides
4
Hitch
Fifth Wheel
# A/C
2
A/C Spec
Dual ducted 15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
2026 Forest River Sierra 4002FB Literature
Unit Specs
- Stock #FSI201
- Year2026
- ManufacturerForest River
- Make Forest River
- ModelSierra
- Floorplan4002FB
- Type Fifth Wheel
- ConditionNew
- Length521' 0"
- VIN4X4FSES28TJ055479
- MSRP $120,519.85
- Sale Price $84,994.00
- Need to know your payment? Use our RV Loan Calculator!
- Sleeps6
- Water Capacity (Fresh)50 gal
- Water Capacity (Black)100 gal
- Water Capacity (Grey)100 gal
- Slideouts4
- Payload Capacity15500 lbs
Email Dealer
Request More Info on this 2026 Forest River Sierra 4002FB Offered for sale by Giant RV
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