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Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Exterior Height: 13 ft 4 in
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV - Jackson
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 16,085 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Friday, October 23, 2026 11:09 AM
Seller: Markquart RV - Appleton
Condition: New
Exterior Length: 42 ft
Sleeps: 4
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Fresh Water Tank Capacity: 50 gal
Description: SIERRA
(2026) These Typical Features, Vary by Model
Living SpacesPower Patio Awning with LED Strip LightingMORryde Step Above Quad Entry StepFoldab...
Updated: Friday, October 23, 2026 11:08 AM
Seller: Kunes RV of Door County
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Exterior Height: 13 ft 4 in
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV - Indianapolis
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Exterior Height: 13 ft 4 in
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV - Nature Coast
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Exterior Height: 13 ft 4 in
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV-Cleburne
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 3
Number of Slide Outs: 3
Gross Vehicle Weight: 13,085 lb
Exterior Height: 13 ft 4 in
Description: New 2026 Forest River RV Sierra 3900HBLR
Details: Forest River Sierra fifth wheel 3900HBLR highlights: Three Slides Entertainment Center Bath and...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV - Grand Rapids
Condition: New
Exterior Length: 43 ft 8 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 16,445 lb
Number of Axles: Tandem
Description: New 2027 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: King Bed Front Living Area Two Tri-Fold Hide-A...
Updated: Friday, October 23, 2026 01:03 AM
Seller: Ron Hoover RV & Marine - Odessa
Condition: New
Stock Number: A6188
VIN: 4X4FSES28VJ055582
Description: New 2027 Forest River RV Sierra 3990FL
Details: Call for details.
Updated: Friday, October 23, 2026 11:09 AM
Seller: Markquart RV - Appleton
Condition: New
Exterior Length: 3 ft 7 in
Sleeps: 8
Number of Slide Outs: 5
Fresh Water Tank Capacity: 50 gal
Stock Number: 348072
Description: NEW 2026 FOREST RIVER SIERRA 3990FL – 348072
**Forest River Sierra fifth wheel 3990FL highlights:**
- King Bed
- Front Living Area
- Tw...
Updated: Monday, September 28, 2026 04:06 PM
Seller: General RV Center
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: Full and Half Lofts King Bed Walk-In Shower Fr...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV-Conroe
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: King Bed Front Living Area Two Tri-Fold Hide-A...
Updated: Friday, October 23, 2026 01:04 AM
Seller: Ron Hoover RV & Marine - San Antonio
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: King Bed Front Living Area Two Tri-Fold Hide-A...
Updated: Friday, October 23, 2026 01:05 AM
Seller: Ron Hoover RV & Marine - Texarkana
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: King Bed Front Living Area Two Tri-Fold Hide-A...
Updated: Friday, October 23, 2026 01:03 AM
Seller: Ron Hoover RV & Marine - Georgetown
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: King Bed Front Living Area Two Tri-Fold Hide-A...
Updated: Friday, October 23, 2026 11:09 AM
Seller: North Country RV
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: Full and Half Lofts King Bed Walk-In Shower Fr...
Updated: Wednesday, October 14, 2026 08:57 AM
Seller: Fun Town RV-Cleburne
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: Full and Half Lofts King Bed Walk-In Shower Fr...
Updated: Tuesday, October 20, 2026 03:46 AM
Seller: Green Castle - Camper Liquidators
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2025 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: Full and Half Lofts King Bed Walk-In Shower ...
Updated: Tuesday, September 01, 2026 09:57 AM
Seller: Camper Liquidators-Chesapeake
Condition: New
Stock Number: T89498
VIN: 4X4FSES26SJ053986
Description: AI Generated Description Forest River Sierra 3990FL stands out with five slideouts and a generous 522 inches of body length, creating expansive int...
Updated: Friday, October 23, 2026 11:02 AM
Seller: Ron Hoover RV & Marine - Tulsa
Condition: New
Exterior Length: 43 ft 6 in
Sleeps: 8
Number of Slide Outs: 5
Gross Vehicle Weight: 15,375 lb
Number of Axles: Tandem
Description: New 2025 Forest River RV Sierra 3990FL
Details: Forest River Sierra fifth wheel 3990FL highlights: Full and Half Lofts King Bed Walk-In Shower Fr...
Updated: Friday, October 23, 2026 11:02 AM
Seller: Ron Hoover RV & Marine - Tulsa
Condition: New
Exterior Length: 43 ft 9 in
Number of Slide Outs: 4
Stock Number: FSI205
VIN: 4X4FSES22VJ055612
Description: 2027 Forest River Sierra 4002FB 2027 Forest River Sierra 4002FB is built for families and luxury travelers seeking a spacious fifth-wheel with prem...
Updated: Tuesday, October 13, 2026 12:39 PM
Seller: Giant RV-Murrieta
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 8
Number of Slide Outs: 4
Gross Vehicle Weight: 13,145 lb
Number of Axles: Tandem
Description: New 2027 Forest River RV Sierra 4003MB
Details: Forest River Sierra fifth wheel 4003MB highlights: Kitchen Island Four Slides Pass-Through Storag...
Updated: Friday, October 23, 2026 03:46 AM
Seller: Keystone RV Center
Condition: New
Exterior Length: 3 ft 7 in
Sleeps: 6
Number of Slide Outs: 4
Fresh Water Tank Capacity: 50 gal
Stock Number: 348071
Description: NEW 2026 FOREST RIVER SIERRA 4002FB – 348071
**Forest River Sierra fifth wheel 4002FB highlights:**
- Two Bedrooms
- Two Full Bathrooms...
Updated: Monday, September 28, 2026 04:06 PM
Seller: General RV Center
Condition: New
Exterior Length: 43 ft 5 in
Sleeps: 6
Number of Slide Outs: 4
Gross Vehicle Weight: 15,500 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 4002FB
Details: Forest River Sierra fifth wheel 4002FB highlights: Two Bedrooms Two Full Bathrooms Loft Kitchen I...
Updated: Friday, October 23, 2026 01:03 AM
Seller: Ron Hoover RV & Marine - Georgetown
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 8
Number of Slide Outs: 4
Gross Vehicle Weight: 15,500 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 4003MB
Details: Forest River Sierra fifth wheel 4003MB highlights: Kitchen Island Four Slides Pass-Through Storag...
Updated: Friday, October 23, 2026 11:02 AM
Seller: Ron Hoover RV & Marine - Texarkana
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 8
Number of Slide Outs: 4
Gross Vehicle Weight: 15,500 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 4003MB
Details: Forest River Sierra fifth wheel 4003MB highlights: Kitchen Island Four Slides Pass-Through Storag...
Updated: Friday, October 23, 2026 11:02 AM
Seller: Ron Hoover RV & Marine - San Antonio
Condition: New
Exterior Length: 43 ft
Sleeps: 6
Number of Slide Outs: 4
Gross Vehicle Weight: 15,500 lb
Fresh Water Tank Capacity: 50 gal
Description: SIERRA
(2026) These Typical Features, Vary by Model
Living SpacesPower Patio Awning with LED Strip LightingMORryde Step Above Quad Entry StepFoldab...
Updated: Monday, October 26, 2026 03:06 AM
Seller: Kunes RV of Door County
Condition: New
Exterior Length: 42 ft 9 in
Sleeps: 8
Number of Slide Outs: 4
Gross Vehicle Weight: 15,500 lb
Number of Axles: Tandem
Description: New 2026 Forest River RV Sierra 4003MB
Details: Forest River Sierra fifth wheel 4003MB highlights: Kitchen Island Four Slides Shower with a Seat ...
Updated: Friday, October 23, 2026 11:02 AM
Seller: Ron Hoover RV & Marine - Lubbock
