2026 FOREST RIVER SIERRA 3990FL
| Manufacturer FOREST RIVER | Sleeps N/A |
| Brand SIERRA | Interior Color N/A |
| Model 3990FL | Slide Outs N/A |
| Stock# 26FR008 | Tip Outs N/A |
| Type FIFTH WHEEL | Exterior N/A |
| Status NEW | Roof Type N/A |
| Exterior Length 43.6 ft. | Leveling N/A |
| Vehicle Weight 13,439 lbs. | Suspension N/A |
The 2026 Forest River Sierra 3990FL is a luxury front-living (FL) fifth wheel that masterfully hides a massive amount of sleeping space within a sophisticated, residential-style layout. It is best known for its "hidden" loft and five-slide-out configuration.
Core Specifications-
Exterior Length: 43' 6"
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Dry Weight (UVW): ~12,439 lbs
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Hitch Weight: ~2,825 lbs
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Slides: 5 (Dual living room, dual kitchen, single bedroom)
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Sleeping Capacity: Up to 8 people
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Elevated Front Living Room: A dedicated entertaining space featuring two tri-fold hide-a-bed sofas, theater seating, an electric fireplace, and a 50" pop-up Smart TV that disappears when not in use.
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The "Secret" Loft: Located above the rear master bedroom and bathroom, this loft features two 44" x 74" bunk mats, wardrobes, and storage, making it perfect for kids while keeping the main floor clear.
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Center Island Kitchen: A chef’s layout with a large stainless sink in the island, a 16 cu. ft. 12V refrigerator, and a Chef Collection 24" oven with a three-burner cooktop.
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Master Suite: Features a King Bed slide, a walk-in closet prepped for a washer/dryer, and easy access to a bathroom with a residential one-piece fiberglass shower with a seat.
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All-Weather Construction: Built with vacuum-bonded laminated sidewalls and Underbelly Armor, protecting the 12V heated holding tanks and mechanicals from road debris and cold.
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Solar & Power: Comes standard with a 200W roof-mounted solar panel and a 30-amp controller, supported by 50-amp service and a 65-amp converter.
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High-End Comfort: Includes a 60,000 BTU on-demand tankless water heater for endless hot showers and dual 15,000 BTU ducted A/C units (with prep for a third).
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Towing Stability: Rides on 7,000 lb axles with Anti-lock Braking Systems (ABS) and Goodyear Radial tires for a safer, smoother tow.
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Fort Saskatchewan, AB
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Note: Please note that product information, pricing and photos are as accurate as possible. Prices and specifications are subject to change without notice.