01 What makes it unique
Forest River lists the 2026 Sierra 3370RLS at 10,319 lb dry, a GVWR of 13,560 lb, a net carrying capacity of 3,241 lb and a pin weight of 1,560 lb. Its dry weight plus its carrying capacity comes to exactly its GVWR.
It is 36' 4" long and 13' 4" high. Forest River prints its tanks as 50 gal fresh, 50 gal grey, 50 gal black.
Every number on this page was read on 7 Nov 2026 from Forest River’s own 2026 Sierra Fifth Wheels floorplan page for the Sierra 3370RLS, whose heading names the model year 2026.
How the 3370RLS differs from the other Sierra Fifth Wheel. How these ranks are worked out.
Next to the 3550BH, the nearest heavier floorplan by dry weight, the 3370RLS is 1,725 lb lighter by dry weight, has a GVWR 1,940 lb lower, has 215 lb less cargo capacity, has a pin weight 820 lb lighter, is 7 ft 2 in shorter, has a grey tank 82 gal smaller and has a black tank 50 gal smaller; the two publish the same exterior height and fresh tank.
02 Full specifications
Dimensions
- Exterior length
- 36' 4"
- Exterior height
- 13' 4"
- Exterior width
- 96"
- Interior height
- Not published by Forest River
Weights
- Dry / unit base weight (UVW)
- 10,319 lb
- GVWR (max loaded)
- 13,560 lb
- Net cargo / payload (CCC)
- 3,241 lb
- Hitch / pin weight
- 1,560 lb
Capacities
- Fresh water
- 50 gal
- Grey water
- 50 gal
- Black water
- 50 gal
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Forest River
Sleeping & layout
- Sleeps
- Not published by Forest River
- Availability (as printed)
- Forest River files this floorplan “DSO” (Dealer Stock Only): sold from dealer inventory, not orderable from the factory
- Model year (as printed)
- page title "2026 Sierra Fifth Wheels 3370RLS - DSO Floorplan - Forest River RV"
- Weight basis (as printed)
- UVW footnote: "*Estimated Average based on standard build optional equipment."
- Maker status (as printed)
- title suffix "- DSO"
- Awning
- 10'8" & 16'
How these published figures sit against the rest of the catalogue: fifth wheel pin weight and payload; fresh, grey and black tank sizes; camper trailer size chart.
Drawn to scale
Weight budget
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
Towing it
Check your vehicle. Enter the ratings from your owner’s manual and the door-pillar placard.
Compares your figures with this page’s published GVWR (13,560 lb) and the upper loaded pin estimate (3,390 lb, a rule of thumb). Your vehicle’s placard and the trailer’s own weight label govern.
Loaded range: 15–25% of GVWR on the pin, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433).
03 The Sierra Fifth Wheels floorplan family
The Sierra Fifth Wheels floorplans below were added from Forest River’s 2026 Sierra Fifth Wheels floorplan page; every Sierra Fifth Wheels floorplan on this site, every model year, is listed on the Sierra Fifth Wheels hub.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| Sierra 3370RLS | 36' 4" | — | Profiled |
| Sierra 3550BH | 43' 6" | — | Profiled |
The Sierra Fifth Wheels floorplans below were added from Forest River’s 2026 Sierra Fifth Wheels floorplan page; every Sierra Fifth Wheels floorplan on this site, every model year, is listed on the Sierra Fifth Wheels hub.
04 Notes on this floorplan
What Forest River does not publish for the Sierra 3370RLS
Forest River prints no tire size, interior height, sleeping capacity for this model, so none is given. Nothing is filled from a sibling model, a different model year or a dealer listing.
Read the label on the trailer
Federal rules put a load-carrying label inside every RV trailer: its unloaded weight with full propane, its cargo carrying capacity and its GVWR (49 CFR 571.110 and 571.120). Those figures come from the trailer itself and govern the towing decision.
05 How it compares
12,044 lb dry and 15,500 lb GVWR, against this model’s 10,319 lb and 13,560 lb.
06 Loading it for a trip
A full 50-gallon fresh tank is about 415 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 13% of the Sierra 3370RLS’s 3,241 lb cargo capacity, leaving 2,826 lb. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).
07 Where this floorplan sits
Closest sibling: the Sierra Fifth Wheels Sierra 3550BH, nearest on the published figures. It differs on 7 of the 8 fields both publish (this plan first): length 36 ft 4 in vs 43 ft 6 in; dry weight 10,319 lb vs 12,044 lb; GVWR 13,560 lb vs 15,500 lb; cargo capacity 3,241 lb vs 3,456 lb; hitch weight 1,560 lb vs 2,380 lb; grey tank 50 gal vs 132 gal; black tank 50 gal vs 100 gal. They match on fresh tank.
Either side of it by GVWR: Sierra Fifth Wheels Sierra 3550BH is 1,940 lb heavier (15,500 lb GVWR).
| Nearest Sierra Fifth Wheels siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Sierra Fifth Wheels Sierra 3370RLS | 36 ft 4 in | — | 10,319 | 13,560 | 3,241 | 1,560 | 50 |
| Sierra Fifth Wheels Sierra 3550BH | 43 ft 6 in | — | 12,044 | 15,500 | 3,456 | 2,380 | 50 |
All 2 Sierra Fifth Wheels floorplans: Sierra Fifth Wheels line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Sierra 3370RLS | 13,560 | 10,319 | — | 36 ft 4 in |
| Vengeance Rogue 32SUT | 13,598 | 9,946 | — | 39 ft 3 in |
| Arctic Fox Edge 275LE | 13,600 | 10,910 | 2 | 29 ft 9 in |
| Arctic Fox NXT 275LE | 13,600 | 11,025 | 2 | 29 ft 9 in |
| Chaparral 336TSIK | 13,500 | 10,520 | — | 37 ft 0 in |
| Durango D302RLT | 13,500 | 11,700 | 4 | 35 ft 2 in |
| Roamer Fifth Wheel 354MBH | 13,500 | 11,310 | — | 39 ft 1 in |
Against the Sierra 3370RLS: the Vengeance Rogue 32SUT is 38 lb heavier and 3 ft longer; the Arctic Fox Edge 275LE is 40 lb heavier and 7 ft shorter; the Arctic Fox NXT 275LE is 40 lb heavier and 7 ft shorter.
08 Common questions about the Sierra 3370RLS
How much does the Sierra 3370RLS weigh?
10,319 lb dry; 13,560 lb GVWR, the most it may weigh loaded.
How much can the Sierra 3370RLS carry?
3,241 lb, 24% of its GVWR (median across 442 fifth wheels here: 19%). A full fresh tank uses 415 lb of it.
What is the pin weight of the Sierra 3370RLS?
1,560 lb as published, 15% of the dry weight (median across 686 fifth wheels here: 19%).
What size tow vehicle does the Sierra 3370RLS need?
A tow rating of at least 13,560 lb, plus payload for the loaded pin weight, passengers and cargo.
What are the tank capacities on the Sierra 3370RLS?
Fresh 50, grey 50, black 50 gallons. Off hookups, fresh water runs out first.
How long is the Sierra 3370RLS?
36' 4" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
11 of the 18 fields this catalogue tracks are published for the Sierra 3370RLS. Not published: interior height, sleeps, slide count, axle count, tire specification, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: forestriverinc.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 15 recall campaigns and 22 owner complaints (model years 2005 on) against the Sierra line (a recall and a complaint are not the same thing).
What to look at on a used one. Across the 22 complaints filed on this line the most-reported components are structure (32%), unknown or other (23%) and tires (14%).
Recall coverage here is not complete, and complaints are owners’ unverified reports (how this record is built). Check a specific VIN at NHTSA before you buy. Full tables are on the Sierra line page.