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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: Wednesday, October 28, 2026 10:48 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: Friday, October 30, 2026 12:07 PM
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: Wednesday, October 28, 2026 10:48 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: Wednesday, October 28, 2026 10:48 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: Wednesday, October 28, 2026 10:48 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: Full and Half Lofts King Bed Walk-In Shower Fr...
Updated: Friday, October 30, 2026 12:07 PM
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: Friday, October 30, 2026 12:07 PM
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 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: Thursday, October 29, 2026 03:13 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 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: Wednesday, October 28, 2026 10:48 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: Wednesday, October 28, 2026 10:48 AM
Seller: Ron Hoover RV & Marine - Tulsa
