Rear window, loft, desk, bunk beds, bunkhouse
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2026 Forest River Sierra 4003MB
NewStock #220076
Listing price
2026 Sierra 4003MB
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
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.
Length
42 ft 9 in
Dry weight
12,609 lbs
GVWR
15,500 lbs
Sleeps
8
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.
$57,980 – $69,995
This unit is ranked 5 of 10 by asking price in this group.
The listing price on this unit has changed 2 times.
See the complete price timeline and the rest of this unit's pricing insights.
Fun Town RV
Edinburgh, IN
Sells faster than 91% of US RV dealers
Compared with 1,119 dealers nationwide
Ask us if you qualify for Forest River’s 0% APR financing for 4 months and $0 payments for 5 months on this RV. See dealer for details.
Forest River Sierra fifth wheel 4003MB highlights:
Kitchen Island
Four Slides
Pass-Through Storage
Free-Standing Dinette
Middle Bunkroom
Have you been looking for a luxury fifth wheel with space for overnight guests or even an office? This model is the one! You will have your own private bedroom up front with a king bed slide out, a dresser with TV prep, plus a walk-in wardrobe with shelves and washer/dryer prep. If you have little ones or guests, they can take the middle bunkroom with a 70¨ Bi-Fold sofa and Flip up bunk above, and the desk in this room will allow you to make it into an office if you need. There is even a 1/2 loft above this room with a ladder for more sleeping or storage space! The main living area includes theater seating across from the entertainment center with a hidden pantry, and a hide-a-bed sofa in this space can also be converted to sleeping space for tag-along campers. The chef will love the kitchen island for more counter space, a 12V refrigerator, plus an outside mini fridge to enjoy the nice weather and have easy access to your favorite drinks.
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!
Options:
Other listings for this floor plan, ranked by condition, model year, distance, price, and listing quality.
INCLUDES - FTRV QUALITY ASSURANCE / CAMP READY PKG
INCLUDES - DEALER PREP
