2026 Forest River Sierra 4002FB

New Fifth Wheel in Montclair, California, 91763

$84,994.00

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New 2026 Forest River Sierra 4002FB available in Montclair, California

2026 Forest River Sierra 4002FB - New Fifth Wheel For Sale by Giant RV in Montclair, California

2026 Sierra 4002FB by Forest River from Giant RV in Montclair, California

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
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Sleeps6
Water Capacity (Fresh)50 gal
Water Capacity (Black)100 gal
Water Capacity (Grey)100 gal
Slideouts4
Payload Capacity15500 lbs

Looking to buy a 2026 Forest River Sierra Fifth Wheel RV?

2026 Forest River Sierra 4002FB

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.

2026 Forest River Sierra 4002FB Features

2026 Forest River Sierra 4002FB Specifications

Dimensions

Height

13' 4"

Length

43' 5"

Width

8' 0"

Weights

Dry Weight

12,889 lbs

GVWR

15,500 lbs

Hitch Weight

2,340 lbs

Payload Capacity

2,611 lbs

Capacities

Refrigerator Capacity

16 cu ft

Sleep Capacity

Water Capacity - Black

100 gal

Water Capacity - Fresh

50 gal

Water Capacity - Grey

100 gal

Exterior

# Awnings

# Axles

# Doors

# Slides

Hitch

Fifth Wheel

Electrical

# A/C

A/C Spec

Dual ducted 15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C

*MFG Specs are for the base unit. Certain options may change specifications listed. Please consult dealer for more details. RVUSA.com cannot guarantee the accuracy of the data presented.