3710HBFBFamily Friendly
Length 42' 9"Sleeps 7
Elevate your family getaways with the 2026 Forest River Sierra 3710HBFB , a luxurious fifth wheel crafted for comfort and convenience.
View Inventory (2)2026 – 2027
Forest River Sierra
Fifth Wheel
The Forest River Sierra is a fifth wheel from Forest River, with 4 floorplans in stock at Giant RV from 42' 9" – 43' 11", sleeping 6 – 7. Compare every floorplan side by side, check the specs, and shop live Sierra inventory across our Southern California locations.
6 – 7Sleeps
42' 9" – 43' 11"Lengths
4Floorplans
3 – 4Slides
12,649 lb. – 13,674 lb.Dry Weight
2,360 lb. – 2,415 lb.Hitch Weight
15,500 lb. – 16,415 lb.GVWR
50 gal. – 70 gal.Fresh Water
Why Buy the Forest River Sierra?
- 4 floorplans in stock from 42' 9" – 43' 11" — compare them side by side below
- Sleeps up to 7 in the 3710HBFB
- Up to 4 slide-outs for extra living space when parked
- Dry weight from 12,649 lb. (3710HBFB) — check it against your tow vehicle’s rating
- Up to 70 gal. fresh water for time away from hookups
- Built for family friendly travel
- Sold and serviced by Giant RV at four Southern California locations
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Floorplans
View All Inventory4002FBFamily Friendly
Length 43' 9"Sleeps 6
2027 Forest River Sierra 4002FB is built for families and luxury travelers seeking a spacious fifth-wheel with premium amenities, rear entertainment, and full-time living comfort.
View Inventory (2)3900HBLR
Length 43' 11"
2027 Forest River Sierra 3900HBLR is built for families and extended-stay RVers seeking a luxury fifth wheel with residential comfort, spacious living, and premium amenities.
View Inventory (2)3905DB
View Inventory (2)Compare All Floorplans
| Model | 3710HBFB | 4002FB | 3900HBLR | 3905DB |
|---|---|---|---|---|
| Length | 42' 9" | 43' 9" | 43' 11" | — |
| Slides | — | 4 | 3 | 4 |
| Sleeps | 7 | 6 | — | — |
| Dry Weight | 12,649 lb. | 13,674 lb. | 13,629 lb. | — |
| GVWR | 15,500 lb. | 16,200 lb. | 16,415 lb. | — |
| Fresh Water | 50 gal. | 70 gal. | 70 gal. | — |
| Best For | Family Friendly | Family Friendly | — | — |
Top 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)
- Underbelly Armor
- Tire Pressure Monitoring System
- Spare Tire
- Large, tinted windows with 80/20 UV prohibitor
- Electric awning with LED light strip
Dimensions & Capacities
| Specification | 3710HBFB | 4002FB | 3900HBLR | 3905DB |
|---|---|---|---|---|
| Length | 42' 9" | 43' 9" | 43' 11" | — |
| Height | 13' 5" | 13' 4" | 13' 5" | — |
| Width | 96" | 101" | 101" | — |
| Awning | 14' | 10'8" & 15' | — | — |
| Fresh Water | 50 gal. | 70 gal. | 70 gal. | — |
| Gray Water | 104 gal. | 104 gal. | 156 gal. | — |
| Black Water | 104 gal. | 104 gal. | 104 gal. | — |
| Cargo Capacity | 2,851 lb. | 2,526 lb. | 2,786 lb. | — |
Weights & Towing
| Weight | 3710HBFB | 4002FB | 3900HBLR | 3905DB |
|---|---|---|---|---|
| Dry Weight | 12,649 lb. | 13,674 lb. | 13,629 lb. | — |
| Unloaded Weight | 12,649 lb. | 13,674 lb. | 13,629 lb. | — |
| GVWR | 15,500 lb. | 16,200 lb. | 16,415 lb. | — |
| Hitch Weight | 2,405 lb. | 2,360 lb. | 2,415 lb. | — |
Why Buy From Giant RV?
- Family Owned Over 40 Years
- 4 Locations to Serve You
- Huge Selection in Stock
- Factory Certified Service
- Financing Available
- Trade-Ins Welcome
Ready to Experience the Sierra?
Shop our selection online or visit one of our 4 Southern California locations today!
People Also Ask
How many floorplans does the Forest River Sierra come in?
Giant RV currently stocks 4 new Forest River Sierra floorplans: 3710HBFB, 4002FB, 3900HBLR and 3905DB. Floorplan availability changes as units sell and arrive, so check live inventory or ask a Giant RV specialist about incoming models.
How long is the Forest River Sierra?
Forest River Sierra floorplans run from 42' 9" (3710HBFB) to 43' 11" (3900HBLR) overall.
How many people does the Forest River Sierra sleep?
Forest River Sierra floorplans sleep 6 – 7, with the 3710HBFB sleeping the most at 7.
How much does the Forest River Sierra weigh?
Forest River Sierra dry weights run from 12,649 lb. (3710HBFB) to 13,674 lb. (4002FB), with a GVWR of up to 16,415 lb.. Make sure your tow vehicle is rated for the loaded weight, not just the dry weight.
How much water does the Forest River Sierra hold?
Fresh water capacity runs 50 gal. – 70 gal., with the 4002FB holding the most at 70 gal., plus 104 gal. gray and 104 gal. black.
Which Forest River Sierra floorplan is best for families?
The 3710HBFB, which sleeps 7, is the pick for families in the current Forest River Sierra lineup. A Giant RV specialist can walk you through every floorplan in person.
Where can I buy a Forest River Sierra in Southern California?
Giant RV has new Forest River Sierra models in stock. Browse live inventory online to see which location has the floorplan you want, or visit us in Colton, Downey, Montclair or Murrieta — financing and trade-ins are available.
Product information, floorplans, features, options and specifications are based on manufacturer data for the units in Giant RV’s inventory and are as accurate as possible. Specifications vary by floorplan, model year and options; check with your Giant RV dealer for current information and specifics. Photographs may show optional equipment.
