Rear window, loft, desk, bunk beds, bunkhouse
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2026 Forest River Sierra 4003MB
NewStock #TJ055147
Listing price
2026 Sierra 4003MB
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
Length
36 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 61 to 90 days.
When was this unit listed?This unit ranks near the lowest priced for new units in this model year.
From the dealer's listing
FOREST RIVER SIERRA 4003MB (FIFTH WHEEL) SPECIFICATIONS: HITCH WEIGHT TBD GVWR TBD UVW TBD CCC TBD EXTERIOR LENGTH TBD EXTERIOR HEIGHT TBD EXTERIOR WIDTH TBD FRESH WATER TBD GRAY WATER TBD BLACK WATER TBD AWNING SIZE 20 Sierra Fifth Wheels Wherever you go, the Sierra line up will ensure you make the most out of every adventure. Unique floorplan designs like bunkhouses, front living spaces, or mid-bunk/offices will accommodate any traveler or group. Automatic level up, 16.8 French door refrigerator, and underbelly armor combine to create a perfect balance of size, space, features and luxury. 4003MB SIERRA FIFTH WHEELS FEATURES & OPTIONS EXTERIOR FEATURES Automatic Electric Level-Up System 2 Towing and Accessory Hitch 7,000lb axles with Anti-lock Braking System GoPower 200W roof mounted solar panel with controller and battery Quad MORryde® step above with strut Goodyear Radial Tires Color match high gloss gel coated colored exterior fiberglass Painted two tone aerodynamic fiberglass front cap with improved turning radius Underbelly Armor TST Tire Pressure Monitoring System Enclosed and heated dump valves 16” Spare tire kit Large tinted windows with 80/20 UV prohibitor Electric awning with LED light strip Prepped for Lippert On-The-Go Ladder Power front jacks with spring loaded snap pins Automotive-style fender skirts Hitch light Porch light with interior switch 30 lb. double LP tanks with auto change over Two exterior speakers Rain gutters with extra long drip spouts (Prevents black streaking) Insulated heavy duty slam lock baggage doors Exterior foldable grab handle Unobstructed pass thru storage area Upgraded aluminum rims Oversized friction hinge entry door INTERIOR FEATURES Stainless steel appliances Rustic wood plank linoleum Hidden hinged, soft close drawers and cabinets Solid Surface Countertops Fiberglass one-piece shower with folding teak seat Washer and Dryer Prep Stainless steel under mounted kitchen sink Decorative backsplash Two color coordinated interiors LED lighting throughout Recessed residential lighting Accent lighting over dinette Mocha accent crown molding over kitchen cabinets Extra large, panoramic picture windows throughout Vented side windows in slideouts TV antenna with booster Solid wood drawer fronts with birch sides Upgraded raised panel cabinet doors with designer rails Bedroom slideout fascia Memory foam mattress Teddy Bear® bunk mats 50” flatscreen TV Premium soundbar with built in DVD player Designer window treatment accented per décor Ceiling fan Tri-fold hide-a-bed sofa Residential stain resistant carpet Quilted bedspread APPLIANCES / SYSTEMS Dual 15,000BTU Ducted Air Conditioners 17 cu. ft. 12V refrigerator 60,000BTU tankless water heater Heated Holding Tanks (12V) Floor ducted 35,000 BTU furnace 30” OTR stainless steel microwave Three burner high output range with 22” oven Interior monitor panel for holding tanks Satellite and cable hookup with RG-6 cable for high quality picture Porcelain foot flush toilet(s) 65 Amp converter Power fan in bathroom CONSTRUCTION Welded aluminum-framed, vacuum bonded laminated superstructure 3/8” roof decking Cambered powder coated frame with rust prohibitor Fully enclosed underbelly 5” truss roof rafters R-10 sidewall construction Laminated sidewalls Laminated slideout walls FOR YOUR SAFETY Smoke alarm Fire extinguisher Breakaway switch (Battery hook-up required) Dead-bolt lock on entry door LP/CO gas detector Fire escape windows POPULAR OPTIONS Free Standing Dinette in place of Booth Central vacuum Slide room awnings (All slides) SUMMIT PACKAGE Electric Leveling System Goodyear Tires with 7,000lb axles 2 Rear Receiver Hitch and 4-Pin Connector Two 15,000BTU Air Conditioners Anti-lock Braking System Tire Pressure Monitoring System 60,000BTU On Demand Water Heater BoonDocker Solar System-200W Panel with controller & battery MORryde Steps with Strut (wherever available) Heated and Enclosed Holding Tanks (12V pads) Washer and Dryer Prep King Wi-Fi Extender System and Olypmus Antenna Underbelly Armor Soft Close Residential Drawers & Cabinets Throughout 50 Flat Screen Television 4 Camera Security Prep with Back-Up Cam Full Coach Water Filter System Power Fan in Bathrooms and Kitchen Enclosed, One-Piece Docking Station Color Matched Gel coated Fiberglass Exterior Aerodynamic Two Tone Fiberglass Painted Front Cap with Lights High Efficiency Radiant Foil (Roof and Floor) Spare Tire CHEF S KITCHEN PACKAGE 17 Cubic FT Stainless Refrigerator (12V) Stainless Range with Cast Iron Grates Solid Surface Countertops Stainless Apron Sink with Strainer Commercial Style Kitchen Faucet 30 Over-the-Range Stainless Microwave Countertop Extension Designer Backsplash Status: READY FOR SALE Weight: 12550
Family RV Center
Sweetwater, TX
Sells faster than 7% of Texas RV dealers
Compared with 230 dealers in Texas
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