New 2026 Forest River RV Sierra 3990FL

Retail Price
$116,461
Sales Price
$79,990
Savings $36,471
Location Caldwell, ID
Stock # N1081
Condition NEW
Year 2026
Make Forest River RV
Model Sierra
Trim 3990FL
Status AVAILABLE

Floorplan

Floor Plan

Specifications

Specifications

Bedroom Features King
Awning 21' Electric w/LED Light Strip
Number Of Axles 2
Width (IN/MM) 8
Height (IN/MM) 7
Length (FT/IN) 43' 6"
Gross Weight Rating (LB/KG) 15375 LBS
Total Fresh Water Tank Capacity (GAL/L) 50
Total Gray Water Tank Capacity (GAL/L) 80
Total Black Water Tank Capacity (GAL/L) 50
Number Of Awnings 1
Refrigerator Size 16 cu ft
Refrigerator Power Mode 12V
Max Sleeping Count 8
Water Heater Tank On Demand Tankless
Shower Standard
Hitch Weight (KG) 2825 LBS
Height (IN) 13.4
General
Exterior Color 0
Interior Color 0
VIN 4X4FSES2XTJ055337
Class Fifth Wheel
Air Conditioning 30000 btu
Dry Weight (LBS) 12439 LBS

Description

Forest River Sierra fifth wheel 3990FL highlights:

  • King Bed
  • Front Living Area
  • Two Tri-Fold Hide-A-Beds
  • Theater Seating

 

The perfect fifth wheel for a larger family! This unit sleeps eight people the loft above the rear master bedroom and bathroom. In the 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 one-piece fiberglass shower for comfort.  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 cambered powder coated frame with rust prohibitor construction allows for more duration of the fifth wheel. Each model also comes with a TV antenna with booster, 60,000BTU on demand tankless water heater, Goodyear Radial tires with 7,000 lb. axles, and the list goes on. The interior is just as impressive with Beachside Sundance Congoleum linoleum, recessed residential lighting, a memory foam mattress, and hidden hinged, soft close drawers and cabinets!

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