+44 - Discount Price: $59,981
- Sale Price: $100,162
- Savings: $40,181
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43ft long
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12,609 lbs
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Sleeps 8
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4 slides
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BunkhouseRear Living Area
4003MB Floorplan
Specifications
| Sleeps | 8 | Slides | 4 |
| Length | 42 ft 9 in | Ext Width | 8 ft |
| Ext Height | 13 ft 4 in | Hitch Weight | 2010 lbs |
| GVWR | 15500 lbs | Dry Weight | 12609 lbs |
| Cargo Capacity | 2891 lbs | Fresh Water Capacity | 50 gals |
| Grey Water Capacity | 100 gals | Black Water Capacity | 50 gals |
| Tire Size | 16" | Furnace BTU | 40000 btu |
| Number Of Bunks | 1 | Available Beds | King |
| Refrigerator Type | 12V | Refrigerator Size | 17 cu ft |
| Cooktop Burners | 3 | Number of Awnings | 2 |
| Axle Weight | 7000 lbs | LP Tank Capacity | 30 lbs |
| Water Heater Capacity | 60000 gal | Water Heater Type | On Demand Tankless |
| AC BTU | 30000 btu | TV Info | LR 50" Flat Screen TV |
| Awning Info | 20' & 10'8" Electric w/LED Light Strip | Axle Count | 2 |
| Washer/Dryer Available | Yes | Number of LP Tanks | 2 |
| Shower Type | Shower w/Seat | VIN | TJ054707 |
Description
Gather in the rear living room, then retreat to your own space when the day is done. This new 2026 Forest River Sierra 4003MB combines a middle room with seating and a work surface, an upper sleeping area and a separate front bedroom.
The rear sofa and paired lounge seats face a fitted TV and fireplace. A kitchen island, refrigerator, microwave and range make shared meals part of the trip, with a dining table nearby for sitting down together.
The bathroom includes a shower, toilet and sink, and storage throughout gives you places for the essentials. Come explore this particular Sierra and picture your crew here. Call Colman’s RV at 217-793-7300 and ask about stock TJ054707.
Features
Standard Features (2026)
Exterior Features
- Automatic Electric Level-Up System
- 2" Towing and Accessory Hitch (Where Available)
- 7,000lb axles with Anti-lock Braking System
- Goodyear Radial Tires w/ anti-lock brakes
- Lippert auto adjust brakes
- Rich Solar 200W roof mounted solar panel with controller and battery
- Quad MORryde® step above with strut (Where Available)
- Color matched high gloss gel coated colored exterior fiberglass
- Painted two tone aerodynamic fiberglass front cap with improved turning radius
- Underbelly Armor
- Tire Pressure Monitoring System
- Spare tire
- 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 pins
- Automotive-style fender skirts
- Hitch light
- Porch light with interior switch
- 30 lb. double LP tanks with auto change over
- Rain gutters with extra long drip spouts (Prevents black streaking)
- Insulated heavy duty slam lock baggage doors
- Exterior foldable grab handle
- Unobstructed pass through storage area
- Upgraded aluminum rims
- Oversized friction hinge entry door with extended latch (Main Entry)
- Exterior LP Quick Connect
Interior Features
- Solid Surface Kitchen Counter tops
- Fiberglass one-piece shower
- Washer and Dryer Prep
- 7’ slide-out height (Main Slides)
- Stainless steel kitchen package
- Beachside Sundance Congoleum linoleum
- Hidden hinged, soft close drawers and cabinets
- Full extension ball bearing drawer guides
- Stainless steel under mounted kitchen sink
- Trash receptacle in kitchen
- Decorative backsplash
- Two color coordinated interiors
- LED lighting throughout
- Recessed residential lighting
- Accent lighting over dinette
- Extra large, panoramic picture windows throughout
- Vented side windows in slide-outs
- TV antenna with booster
- Solid wood drawer fronts with birch sides
- Solid wood, square inset cabinet doors, painted or wood grain
- Bedroom slide-out fascia
- Memory foam mattress
- Teddy Bear® bunk mats
- 50" flatscreen smart TV (65” 3900HBLR)
- JBL Aura Cube FM/Bluetooth media center
- Designer window treatment
- Ceiling fan
- Tri-fold hide-a-bed sofa
- Quilted bedspread
- Prepped for inverter
Appliances/Systems
- Dual ducted 15k BTU Air Conditioners, prepped for 3rd 15k BTU A/C
- AIRDIRECT® Air Vents for improved efficiency
- 16 cu. ft. 12V refrigerator
- 60,000BTU On Demand Tankless Water Heater
- 40,000BTU furnace
- Heated Holding Tanks (12V)
- Floor ducted 40,000BTU furnace
- 30" OTR stainless steel microwave
- Chef collection 3 burner / 24" oven with drawers
- 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 Kitchen and Bathroom(s)
Construction
- 5/8" tongue and groove DryMax® OSB floor decking
- 2 x 3 floor joists, 12" on center
- Laminated sidewalls
- 3/8" roof decking (Full walk-on roof)
- Cambered powder coated frame with rust prohibitor
- Underbelly armor
- 5" truss roof rafters
- R-10, 2" sidewall construction
- Laminated slide-out walls
For Your Safety
- Smoke alarm
- Fire extinguisher
- Breakaway switch (Battery hook-up required)
- Dead-bolt lock on entry door
- LP/CO2 gas detector
- Fire escape windows
Popular Options
- Two chairs in place of ottoman bench
- Cordless vacuum
- Slide room awnings (N/A dinette slides)
- Washer and Dryer (Standard on 3800RK & 3900HBLR)
- Dual pane windows (N/A 3900HBLR 84” Window)
- 3rd A/C power saver direct dump system w/ wall thermostat
Please see us for a complete list of features and available options!
All standard features and specifications are subject to change.
All warranty info is typically reserved for new units and is subject to specific terms and conditions. See us for more details.
Due to the current environment, our features and options are subject to change due to material availability.
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The Boat Dock is not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales tax,registration tags, and freight & prep if applicable. Manufacturer pictures, specifications, and features may be used in place of actual units on our lot. Please contact us @217-793-7300 for availability as our inventory changes rapidly. All calculated payments are an estimate only and do not constitute a commitment that financing or a specific interest rate or term is available. All estimates are based on 15% down and 7.99% APR on new units and 9.99% APR on used units. Terms will vary according to price.
Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. Where an image has a stock image indicator, please confirm specific unit details with your dealer representative.
