2026 Forest River Sierra 3900HBLR

New Fifth Wheel in Downey, California, 90241

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New 2026 Forest River Sierra 3900HBLR available in Downey, California

2026 Forest River Sierra 3900HBLR - New Fifth Wheel For Sale by Giant RV in Downey, California

2026 Sierra 3900HBLR by Forest River from Giant RV in Downey, California

Unit Specs

Stock #FSI174
Year2026
ManufacturerForest River
Make Forest River
ModelSierra
Floorplan3900HBLR
Type Fifth Wheel
ConditionNew
Length42' 9"
VIN4X4FSER29TJ054654
MSRP $112,616.50
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Water Capacity (Fresh)50 gal
Water Capacity (Black)104 gal
Water Capacity (Grey)136 gal
Slideouts3

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

2025 FOREST RIVER SIERRA 3900HBLR

Get ready for a family getaway with the 2025 Forest River Sierra 3900HBLR fifth wheel at Giant RV in California! Ideal for full-time RVing, this RV features three slide-outs for spacious living, a rear entertainment center with a 50” LED TV for cozy movie nights, and a front king bedroom for restful sleep, sleeping up to 3. The chef’s kitchen boasts a 12V fridge to keep groceries fresh, a 3-burner cooktop for gourmet meals, and a microwave for quick snacks. Enjoy dual 12’ & 18’ power awnings for shaded relaxation. Equipped with dual 15,000 BTU A/Cs for cool comfort, a 35,000 BTU furnace for warmth, and 200W solar for off-grid power.

View a video of this 2026 Forest River Sierra 3900HBLR RV on YouTube!

2026 Forest River Sierra 3900HBLR Features

2026 Forest River Sierra 3900HBLR Specifications

Dimensions

Height

13' 4"

Length

42' 9"

Width

8' 0"

Weights

Dry Weight

13,284 lbs

GVWR

16,085 lbs

Hitch Weight

2,085 lbs

Payload Capacity

2,801 lbs

Capacities

Refrigerator Capacity

16 cu ft

Sleep Capacity

Water Capacity - Black

104 gal

Water Capacity - Fresh

50 gal

Water Capacity - Grey

136 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 base unit. Certain options may change specifications listed. Please consult dealer for more details. Data is provided by a 3rd party. RVUSA.com cannot guarantee the accuracy of the data presented.