Rear window, loft, desk, bunk beds, bunkhouse
Get in touch and we'll be happy to answer any questions or set up an appointment to see it in person.
2026 Forest River Sierra 4003MB
NewStock #9561
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 9 in
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 longer than 120 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
Introducing the 2026 Forest River RV Sierra 4003MB, a fifth-wheel designed for families and adventure seekers alike. With a generous length of 42.75 ft and the ability to sleep 8, this RV is perfect for creating lasting memories on the road. Enjoy the comfort of a 30,000 BTU air conditioning system and 40,000 BTU heater, ensuring you stay cozy in any climate. The spacious interior layout, complemented by four slides, offers ample room for relaxation and entertainment. With a dry weight of 12,609 lbs and a GVWR of 15,500 lbs, it's designed for easy towing. Schedule your tour today!
Zoomers RV
Wabash, IN
Sells faster than 44% of US RV dealers
Compared with 1,318 dealers nationwide
Other listings for this floor plan, ranked by condition, model year, distance, price, and listing quality.
The listing price on this unit has changed 3 times.
