Rear window, loft, desk, bunk beds, bunkhouse
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2026 Forest River Sierra 4003MB
NewStock #FR055173
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
9
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 7 of 10 by asking price in this group.
The listing price on this unit has changed 3 times.
See the complete price timeline and the rest of this unit's pricing insights.
Rocky Ridge RV
Muskogee, OK
Sells faster than 83% of US RV dealers
Compared with 1,119 dealers nationwide
The 2026 Forest River Sierra 4003MB stands out with 4 slideouts and a luxurious center kitchen floorplan featuring a Kitchen Island that elevates the living space. Built for extended trips, it carries a GVWR of 15500 lbs with a payload capacity of 2891 lbs and a hitch weight of 2010 lbs, while offering up to 9 sleeping locations across its 42.75 ft length and 8 ft width. With fiberglass sidewall construction, a total fresh water capacity of 50 gallons and ample gray and black water tanks, this towable model blends premium build quality with practical expedition-ready utility. View the Forest River Sierra at Rocky Ridge RV.
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