Rear window, loft, desk, bunk beds, bunkhouse
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2026 Forest River Sierra 4003MB
NewStock #49W136X
Listing price
2026 Sierra 4003MB
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
Length
42 ft
Dry weight
12,609 lbs
Sleeps
8
Slideouts
4
What sets the 4003MB apart from most bunkhouse fifth wheels is its rear living area anchored by a rear window, putting the couch and TV at the scenic end of the rig while bunk beds and a loft stay tucked in the middle. The front bedroom earns its keep with a King bed, east/west orientation, and a washer/dryer prep. Details that lean hard into full-time or extended-trip living. A kitchen island with solid surface countertops, a farmhouse sink, and a hidden pantry give the cook's space a residential feel, and the outdoor kitchen means meal prep doesn't have to stay inside. Forest River's Sierra line backs it all up with 7,000 lb. axles with ABS, four-point electric leveling, and a 200W solar panel already on the roof.
Many factors play into a unit's listing price and what you should pay. This guide provides a ballpark estimate, but it does not factor in your exact scenario or how different listings are equipped.
There may be room for price negotiation.
Unlock pricing insights with RV Envy Pro →$59,900 – $69,995
This unit has been on the lot for 30 days or less.
When was this unit listed?This unit ranks near the lowest priced for new units in this model year.
From the dealer's listing
SIERRA
(2026) These Typical Features, Vary by Model
Living Spaces
Power Awning with LED Strip Lighting
MORryde Step Above Quad Entry Step
Foldable Entry Assist Handle
Porch Light Indoor Control Switch
Friction Hinge Entry Door with Deadbolt Lock
Beachside Sundance Congoleum Linoleum
Recessed LED Lighting Throughout
Accent Lighting
Dark Tinted Windows
Egress Windows
Vented Slideout Windows
Designer Window Treatments
Entertainment Center
Fireplace Spaceheater (vbm)
Tri-Fold Hide-a-Bed Sofa
Theater Seating (vbm)
Ceiling Fan
Solid Wood Inset Panel Cabinet Doors
Solid Wood Drawer Fronts with Birch Sides
Soft-Close Drawers and Doors
Dining
Dinette Overhead Accent Lighting
Pantry
Solid Surface Countertops
Countertop Extension
Designer Backsplash
Stainless Steel Undermount Sink
Commercial Style Faucet
Stainless Steel Kitchen Package
12v 17cf Refrigerator
3-Burner Chef Collection Range
24-inch Oven with Drawer
30-inch Over-the-Range Microwave
Power Galley Fan
Technology & Entertainment
System Center
LP CO and Smoke Detectors
Holding Tank Monitor Panel
Automatic Electric Level-up System
Tire Pressure Monitor System
TV Antenna with Booster
RG-6 Coax Cable TV and Satellite Hookups
Large Flat Screen Smart TV
JBL Aura Cube FM Bluetooth Media Center
Sleeping
Memory Foam Mattress
Quilted Bedspread
Bedside USB Outlets
Bedroom TV Prep
Dresser Drawers
Wardrobe Shelving
Washer Dryer Prep
Teddy Bear Bunk Mats
Bathroom
Medicine Cabinet
Vanity Sink
Linen Closet
Fiberglass Shower Folding Teak Seat
Porcelain Foot Flush Toilet
Power Fan
Kunes RV
Baraboo, WI
Sells faster than 15% of Wisconsin RV dealers
Compared with 37 dealers in Wisconsin
Other listings for this floor plan, ranked by condition, model year, distance, price, and listing quality.
Mechanicals
200w Rich Solar Roof Mount Solar Panel
Solar Controller and Battery
Two 30# LP Bottles with Auto Changeover
65-Amp Converter
Prepped for Inverter
Two 15k Ducted AC Units, Prep for 3rd
AirDirect Air Vents
40k Floor Ducted Furnace
Enclosed Docking Station
12v Tank Heat Pads
Whole Coach Water Filtration
60k Tankless On Demand Hot Water
Enclosed Heated Dump Valves
Coach Build
Hitch Light
Power Front Jacks with Snap Pin Springs
Cambered Powder Coated Frame
7000# Axles
Lippert Auto Adjust Brakes
Anti-Lock Braking System
16-inch Upgrade Aluminum Wheels
Goodyear Radial Tires
Spare Tire
2-inch Receiver (vbm)
5/8-inch T&G DryMax OSB Decking
Underbelly Armor
Welded Aluminum Structure
Vacu-Bond Laminate Sidewalls
R10 Sidewall Construction
Block Foam Insulation
Radiant Foil Roof and Floor
High Gloss Fiberglass Exterior
Painted Two Tone Front Cap
5-inch Truss Roof Rafters
Walk-on Rubber Roofing
Gutters Extra Long Downspouts
Lippert On-the-Go Ladder Prep
Unobstructed Pass-Through
Insulated Slam Latch Cargo Doors
