2026 Forest River Sierra 3990FL

New Fifth Wheel in Crystal River, Florida, 34428

$77,988.00
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New 2026 Forest River Sierra 3990FL available in Crystal River, Florida
2026 Forest River Sierra 3990FL - New Fifth Wheel For Sale by Fun Town RV  - Nature's Coast in Crystal River, Florida features Slideout
2026 Sierra 3990FL by Forest River from Fun Town RV  - Nature's Coast in Crystal River, Florida
New 2026 Forest River Sierra 3990FL available in Crystal River, Florida

Unit Specs

  • Stock #217296
  • Year2026
  • ManufacturerForest River
  • Make Forest River
  • ModelSierra
  • Floorplan3990FL
  • Floorplan LayoutBunkhouse
    Front Entertainment
    Front Living Area
    Kitchen Island
    Loft
    Rear Bedroom
  • Type Fifth Wheel
  • ConditionNew
  • Length43' 0"
  • VIN4X4FSES27TJ054856
  • Price $97,180.00
  • Sale Price $77,988.00
  • Need to know your payment? Use our RV Loan Calculator!
  • Interior ColorSWITCHBACK
  • Exterior ColorBEIGE
  • Sleeps8
  • Water Capacity (Fresh)50 gal
  • Water Capacity (Black)50 gal
  • Water Capacity (Grey)80 gal
  • Slideouts5
  • Tow/Hitch Weight2825 lbs

Forest River Sierra fifth wheel 3990FL highlights:

  • Full and Half Lofts
  • King Bed
  • Walk-In Shower
  • Front Living Area
  • Two Tri-Fold Hide-A-Beds
  • Theater Seating

 

The perfect fifth wheel for a larger family! This unit sleeps eight or more with the full and half lofts above the rear master bedroom and bathroom. In the full loft area there are two 44" x 74" bunk mats for comfort as well as wardrobe/storage at the head of each. The master bedroom features a king size bed that slides out to create more space by the bed. A spacious bath features a walk-in shower for comfort and includes a seat so you can relax while you shower. A spacious kitchen features two slides, a free standing dinette in one, and the 12V refrigerator and stove in the other. There is also a center island with large sink for added food prep space. Head up the steps in front to a dual slide front living area with 50" TV and fireplace beneath the window. There is also theater seating opposite the TV, and a tri-fold hide-a-bed in each slide allowing added sleeping space when needed.

 

Each one of these Forest River Sierra fifth wheels are equipped with everything you need to make the most of each adventure! The underbelly armor will protect your unit's vitals from road debris and the painted two tone aerodynamic fiberglass front cap has an improved turning radius to make them easier to navigate. With an electric leveling system, you can set your unit up quick and easy then get to having fun faster than ever. The welded aluminum framed, vacuum bonded laminated superstructure will hold up through every adventure and the cambered powder coated frame comes with rust prohibitor to last longer. Each model also includes the Summit Package that comes with a king Wi-Fi extender system and Olympus antenna, a full coach water filter system, Goodyear tires with 7,000 lb. axles, and the list goes on. The interior is just as impressive with rustic wood plank linoleum, recessed residential lighting, a memory foam mattress, and mocha accent crown molding over the kitchen cabinets!

  • Bunkhouse
  • Cold Weather Package
  • Dual or Triple AC
  • Exterior: Fiberglass
  • Front Entertainment
  • Front Living
  • King Bed
  • Kitchen Island
  • Loft
  • Rear Bedroom
  • INCLUDES - FTRV QUALITY ASSURANCE / CAMP READY PKG
  • INCLUDES - DEALER PREP
  • NO HIDDEN FEES
  • SUMMIT PACKAGE
  • CHEF&aposS KITCHEN PACKAGE
  • PORTABLE VACUUM

2026 Forest River Sierra 3990FL Features


  • Exterior
    Slideout

2026 Forest River Sierra 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

10

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

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.

2026 Forest River Sierra 3990FL Literature


Seller Info

Fun Town RV - Nature's Coast

9800 N Citrus Ave
Crystal River, FL 34428

Member Since 2025

See 304 Reviews

Unit Specs

  • Stock #217296
  • Year2026
  • ManufacturerForest River
  • Make Forest River
  • ModelSierra
  • Floorplan3990FL
  • Floorplan LayoutBunkhouse
    Front Entertainment
    Front Living Area
    Kitchen Island
    Loft
    Rear Bedroom
  • Type Fifth Wheel
  • ConditionNew
  • Length43' 0"
  • VIN4X4FSES27TJ054856
  • Price $97,180.00
  • Sale Price $77,988.00
  • Need to know your payment? Use our RV Loan Calculator!
  • Interior ColorSWITCHBACK
  • Exterior ColorBEIGE
  • Sleeps8
  • Water Capacity (Fresh)50 gal
  • Water Capacity (Black)50 gal
  • Water Capacity (Grey)80 gal
  • Slideouts5
  • Tow/Hitch Weight2825 lbs

Estimated Payment-

Interest Rate % *(W.A.C.)
Term Years
Down Payment $
*W.A.C. = With approved credit

Email Seller

Request More Info on this 2026 Forest River Sierra 3990FL Offered for sale by Fun Town RV - Nature's Coast
Fun Town RV  - Nature's Coast
Fun Town RV - Nature's Coast

9800 N Citrus Ave
Crystal River, FL 34428

Phone: Click to Call

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2026 Forest River Sierra 3990FL Gallery

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New 2026 Forest River Sierra 3990FL available in Crystal River, Florida
2026 Forest River Sierra 3990FL - New Fifth Wheel For Sale by Fun Town RV  - Nature's Coast in Crystal River, Florida features Slideout
2026 Sierra 3990FL by Forest River from Fun Town RV  - Nature's Coast in Crystal River, Florida
New 2026 Forest River Sierra 3990FL available in Crystal River, Florida