The 2026 Sierra 4003MB is a full-size, four-slide, mid-bunk-style fifth wheel built for families or groups — offering a private king bedroom, a separate bunkroom + loft, expansive living space, and heavy-duty construction for extended camping or full-time use.

Interior Features

• Master suite up front: Private bedroom with slide-out king bed, dresser, TV prep, walk-in wardrobe with shelves, washer/dryer prep — offering privacy and storage.
• Mid-bunkroom + loft: Middle section includes a hide-a-bed sofa, bunk above, plus a loft bunk accessible by ladder — great for kids, guests, or even a small office setup.
• Living / kitchen area: Large kitchen island, full stainless-steel kitchen package, 17 cu ft 12 V refrigerator, 3-burner cooktop, solid-surface countertops, under-mounted sink, decorative backsplash, ample storage with soft-close drawers & cabinets. Living area offers theater seating, panoramic windows, hide-a-bed sofa for extra sleeping, a large entertainment center with 50″ flat-screen TV, and quality lighting throughout.
• Bathroom & bunkhouse bath: One shower with seat, large fiberglass one-piece shower, plus standard bath amenities.
• Interior build & finishes: Wood-inset cabinet doors, solid-wood drawer fronts, high-floor decking (walk-on roof), quality linoleum flooring, recessed residential-style lighting, accent lighting over dinette — built for comfort and durability.

Exterior & Construction Features

• Heavy-duty chassis & build: 7,000-lb axles with anti-lock brakes, Goodyear radial tires, Lippert auto-adjust brakes, underbelly armor, powder-coated cambered frame with rust protection.
• Convenience and readiness features: Automatic electric level-up system, 200 W roof-mounted solar panel with controller & battery, large tinted windows (UV-protected), oversized entry door, spare tire, hydraulic/front power jacks, dual LP tanks with auto-switch, exterior LP quick-connect, pass-through storage.
• Outdoor comfort: Two electric awnings with LED light strips, large pass-through storage, heavy-duty painted fiberglass front cap for improved aerodynamics and turning radius.