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2017 Forest River Sierra 378FB – Front-Bath Luxury with Rear-Living Comfort
The 2017 Forest River Sierra 378FB brings true residential polish to a road-ready fifth wheel. With a signature front bathroom retreat, a convenient mid-coach half bath, and a bright rear-living lounge, the 378FB is tailor-made for travelers who want big-home comfort without giving up campsite maneuverability. From morning coffee at the free-standing table to movie night by the fireplace, every inch of this layout is designed to feel open, functional, and beautifully finished.
Key Features
Front Bath Retreat
Step up to a spacious front bath with a large, glass-door shower, generous vanity counter space, linen storage, and a walk-in wardrobe with washer/dryer prep—a true at-home routine on the road.
Convenient Half Bath
The mid-coach powder room keeps traffic out of the primary suite and makes quick stops or guest visits easy, clean, and private.
Rear-Living Lounge
Settle into plush recliner seating and a comfortable tri-fold sleeper sofa across the back wall. The entertainment center—with TV placement at a natural eye line and an electric fireplace below—anchors cozy evenings and rainy-day downtime.
Chef’s Kitchen, Real Storage
A residential feel without the bulk: solid-surface countertops, deep stainless sink with high-rise faucet, oven and three-burner range, microwave, and a residential-style refrigerator. A true pantry swallows weekend groceries and road-trip snacks, while full-extension drawers and overhead cabinets keep cookware organized.
Private Primary Suite
A walk-around bed delivers easy access on both sides, flanked by wardrobes and overheads. Close the door and you’ve got a quiet retreat steps from the front bath.
Four-Season Confidence
Insulated construction, an enclosed underbelly, and efficient ducted climate systems help tame temperature swings so you can stretch your season beyond perfect-weather weekends.
Easy Arrival, Easy Departures
A power auto-leveling system and solid entry steps make setup fast and sturdy. Wide-stance running gear and a balanced frame inspire confidence backing into tighter, tree-lined sites.
Campsite Living Made Simple
Roll out the power awning with LED lighting, cue your favorite playlist on the exterior speakers, and enjoy a second living room under the stars. Large, tinted windows and day/night shades keep the interior bright when you want it—and private when you don’t.
Smart, Everywhere Storage
Pass-through front storage for chairs and totes, dedicated spaces for hoses and cords, under-bed and overhead compartments inside—everything has a home so your living area stays clutter-free on travel days.
Why This Floorplan Works
The 378FB blends a rear lounge that truly feels like a living room with a chef-friendly galley and the luxury of a front bath + mid half-bath—a combination that keeps mornings smooth, guests comfortable, and evenings relaxed. It’s the sweet spot for couples who host and travelers who want full-time convenience without a full-time footprint.
Experience the Miller’s RV Difference!
At Miller’s RV, family-owned and operated since 1986, we back premium coaches with premium care—expert guidance, transparent pricing, and factory-trained service before, during, and after the sale.
Enjoy the Journey with Miller’s RV!
Visit us in Baton Rouge, LA, to tour the 2017 Forest River Sierra 378FB and see how front-bath luxury, easy setup, and rear-living comfort come together for unforgettable adventures.
Our EVERYDAY LOW PRICES are often lower than what our manufacturers allow us to advertise online! Click the GET LOWEST PRICE button for your LOWEST PRICE!
| Stock # | 23-039P |
| Year | 2017 |
| Make | Forest River |
| Model | Sierra |
| Trim | 378FB |
| Condition | USED |
| Status | AVAILABLE |
| Location | Millers RV |
| General | |
|---|---|
| Category Class | Fifth Wheel |
| Secondary Class | Rear Livingroom |
| Slide(s) | 3 |
| Sleeps | 4 |
| VIN | 4X4FSEP25HJ044357 |
| Weights, Dimensions & Capacities |
|---|
| Options & Features |
|---|
| Construction, Safety & Power |
|---|
| Engine |
|---|
| Other Specifications | |
|---|---|
| Wheels Composition | Aluminum |
| Number Of Axles | 2 |
| Rear Tire Full Spec | 16-Inch Radial Tires (E-Rated) |
| Rear Brake Type | Electric Drum |
| Length (FT/M) | 42.58 / 13 |
| Height (IN/MM) | 158 / 4013.2 |
| Interior Height (IN/MM) | 84 / 2133.6 |
| Length (FT) | 42' |
| Length (FT/IN) | 7' |
| Gross Weight Rating (LB/KG) | 15500 LBS |
| Number Of Propane Tanks | 2 |
| Total Propane Tank Capacity (GAL/LBS) | 14.2 / 60 |
| Body Material | Aluminum |
| Sidewall Construction | Fiberglass |
| Number Of Doors | 1 |
| Sliding Glass Door | No |
| Number Of Slideouts | 3 |
| Power Retractable Slideout | Yes |
| Number Of Awnings | 1 |
| Awning Length (FT/M) | 20 / 6.1 |
| Power Retractable Awning | Yes |
| Screened Room | No |
| Leveling Jack Type | Front Power / Rear Manual |
| Sky Light | Standard |
| Roof Vents | Standard |
| Exterior Ladder | Standard |
| Exterior Shower | Standard |
| Exterior Grille | Standard |
| Exterior Kitchen | Standard |
| Voltage Meter | Standard |
| Trailer Level Gauge | Standard |
| Generic Type Primary | Fifth Wheel |
| Manufacturer Country | USA |
| Introduction Year | 2015 |
| Regional Availablility | All Regions |
| Display Name | Sierra 378FB |
| Kitchen Table Configuration | Chairs |
| Kitchen Location | Center |
| Living Area Location | Rear |
| Number Of Oven Burners | 3 |
| Overhead Fan | Yes |
| Layout | Oven / Stove |
| Microwave Oven | Standard |
| Refrigerator Size | Mid-Size |
| Refrigerator Power Mode | Electric / Propane |
| Sink Cover Cutting Boards | Standard |
| Number Of Sofas | 1 |
| Sofa Material | Vinyl |
| Reclining Sofa | No |
| Number Of Recliner Rockers | 2 |
| Max Sleeping Count | 4 |
| Number Of Bunk Beds | 0 |
| Number Of Double Beds | 0 |
| Number Of Full Size Beds | 0 |
| Number Of Queen Size Beds | 1 |
| Number Of Convertible Sofa Beds | 1 |
| Master Bedroom Flooring Type | Carpet |
| Master Bedroom Door Style | Conventional Door |
| Full Size Master Bedroom Closet | Yes |
| Master Bedroom Mirror Doors | Yes |
| Master Bedroom Shades/Curtains | Yes |
| Master Bedroom Location | Center |
| Bunkhouse | No |
| Heated | No |
| Bed Spreads | Standard |
| Number Of Bathrooms | 2 |
| Bathroom Flooring Type | Vinyl |
| Bathroom Location | Front / Center |
| Toilet Type | Porcelain |
| Door Type | Plastic / Glass |
| Bathroom Sink | Standard |
| Bathroom Medicine Cabinet | Standard |
| Bathroom Mirror | Standard |
| Bathroom Vent Fan System | Standard |
| Sink Faucet | Standard |
| Battery Power Converter | Yes |
| Air Conditioning Prewiring | Yes |
| Cable Prewiring | Yes |
| Phone Prewiring | No |
| Heat Prewiring | Yes |
| TV Antenna Prewiring | Yes |
| Satellite Prewiring | Yes |
| Washer/Dryer Prewiring | Yes |
| Exterior Plugs | Standard |
| Ground Fault Plugs | Standard |
| Smoke Detector | Standard |
| Carbon Monoxide Detector | Standard |
| Propane Alarm | Standard |
| Number Of Emergency Exits | 1 |
| Air Conditioning Type | Automatic |
| Heater Type | Automatic |
| Water Heater Pump Power Mode | Electrical / Propane |
| Water Heater Tank Bypass | Yes |
| Freeze Proof Insulation | Standard |
| Number Of Radios | 1 |
| Surround Sound | Yes |
| Number Of Discs | 1 |
| Dvd Player | Standard |
| Number Of Televisions | 2 |
| Exterior Entertainment System | Standard |
| Retractable Roof Antenna | Standard |
| Exterior Flood Lights | Standard |
| Wallpaper | Yes |
| Interior Wood Finish | Yes |
| Curtains/Shades | Standard |
| Basic Warranty (MO) | 12 |
| msrp | 0 |
| Type | Type: Fifth Wheel |
2017 Forest River Sierra 378FB – Front-Bath Luxury with Rear-Living Comfort
The 2017 Forest River Sierra 378FB brings true residential polish to a road-ready fifth wheel. With a signature front bathroom retreat, a convenient mid-coach half bath, and a bright rear-living lounge, the 378FB is tailor-made for travelers who want big-home comfort without giving up campsite maneuverability. From morning coffee at the free-standing table to movie night by the fireplace, every inch of this layout is designed to feel open, functional, and beautifully finished.
Key Features
Front Bath Retreat
Step up to a spacious front bath with a large, glass-door shower, generous vanity counter space, linen storage, and a walk-in wardrobe with washer/dryer prep—a true at-home routine on the road.
Convenient Half Bath
The mid-coach powder room keeps traffic out of the primary suite and makes quick stops or guest visits easy, clean, and private.
Rear-Living Lounge
Settle into plush recliner seating and a comfortable tri-fold sleeper sofa across the back wall. The entertainment center—with TV placement at a natural eye line and an electric fireplace below—anchors cozy evenings and rainy-day downtime.
Chef’s Kitchen, Real Storage
A residential feel without the bulk: solid-surface countertops, deep stainless sink with high-rise faucet, oven and three-burner range, microwave, and a residential-style refrigerator. A true pantry swallows weekend groceries and road-trip snacks, while full-extension drawers and overhead cabinets keep cookware organized.
Private Primary Suite
A walk-around bed delivers easy access on both sides, flanked by wardrobes and overheads. Close the door and you’ve got a quiet retreat steps from the front bath.
Four-Season Confidence
Insulated construction, an enclosed underbelly, and efficient ducted climate systems help tame temperature swings so you can stretch your season beyond perfect-weather weekends.
Easy Arrival, Easy Departures
A power auto-leveling system and solid entry steps make setup fast and sturdy. Wide-stance running gear and a balanced frame inspire confidence backing into tighter, tree-lined sites.
Campsite Living Made Simple
Roll out the power awning with LED lighting, cue your favorite playlist on the exterior speakers, and enjoy a second living room under the stars. Large, tinted windows and day/night shades keep the interior bright when you want it—and private when you don’t.
Smart, Everywhere Storage
Pass-through front storage for chairs and totes, dedicated spaces for hoses and cords, under-bed and overhead compartments inside—everything has a home so your living area stays clutter-free on travel days.
Why This Floorplan Works
The 378FB blends a rear lounge that truly feels like a living room with a chef-friendly galley and the luxury of a front bath + mid half-bath—a combination that keeps mornings smooth, guests comfortable, and evenings relaxed. It’s the sweet spot for couples who host and travelers who want full-time convenience without a full-time footprint.
Experience the Miller’s RV Difference!
At Miller’s RV, family-owned and operated since 1986, we back premium coaches with premium care—expert guidance, transparent pricing, and factory-trained service before, during, and after the sale.
Enjoy the Journey with Miller’s RV!
Visit us in Baton Rouge, LA, to tour the 2017 Forest River Sierra 378FB and see how front-bath luxury, easy setup, and rear-living comfort come together for unforgettable adventures.
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