01 What makes it unique
The Rockwood Signature 8391FK leaves Forest River's factory at 10,409 lbs dry with 2,087 lbs of cargo capacity. Forest River publishes no GVWR for this line, so the loaded rating is not quoted on this page and is not computed from the other two figures. What the cargo number covers is defined by the factory: fresh water, gear, food, batteries and every dealer-installed accessory come out of it. Fresh water is 8.3 lb per gallon, so filling the 54-gallon fresh tank spends 448 lbs of the 2,087 lbs before anything else goes in.
Tongue weight is 1,385 lbs, 13% of the dry weight as published; it rises as the trailer is loaded and counts against the tow vehicle’s tongue-weight and payload limits (tongue weight by size).
Off hookups: 184 gallons of grey and black capacity against 54 gallons of fresh water, so fresh water runs out first (tank sizes by length).
Against the rest of the Rockwood Signature roster this is the 11th of 12 floorplans by dry weight, in a line that runs from 7,709 lbs to 11,259 lbs. It sits in the heavier third of the line.
Plan the tow on loaded weight, not the 10,409 lbs dry figure: half the published cargo capacity brings this plan to about 11,453 lbs. Forest River publishes no loaded rating for this line, so the ceiling is the one on the trailer’s own weight label (how to read trailer weights).
Forest River’s line listing and this floorplan’s own factory page agree on all 4 shared figures. No GVWR is published for this line, so dry plus cargo has no rating to check against. A missing row means Forest River does not publish that figure (how figures are verified).
Forest River's own description of this floorplan reads: “Wide-body front kitchen layout with large front window, island, residential appliances, and plenty of countertop space. Flexible dining with sliding table and flip-out leaf. Living area includes theater seating, fireplace, and entertainment center. Private rear bedroom offers a king bed, large wardrobe, and washer/dryer prep. Spacious bath features a one-piece fiberglass shower, porcelain toilet, and ample linen…” That is the factory's marketing copy rather than a specification, and nothing in it is treated as a verified field on this page - layout descriptions, sleeping arrangements and feature claims in factory copy are not carried into the spec table unless the factory also publishes them as specifications.
How the 8391FK differs from the other eleven Rockwood Signature floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2027). How these ranks are worked out.
- Dry weight, 10,409 lb: second-heaviest of twelve, between the 8393RK (10,319 lb) and the 8421DB (11,259 lb).
- Tongue weight, 1,385 lb: heaviest of twelve, level with the 8421DB; next is the 8336BH (1,376 lb).
- Tongue weight as a share of dry weight, 13.3%: fifth-largest of twelve, between the 8329SB (12.8%) and the 8263MBR (13.6%).
- Cargo capacity, 2,087 lb: sixth-smallest of twelve, between the 8393RK (2,082 lb) and the 8392RL (2,092 lb).
- Length, 38 ft 8 in: shared with the 8392RL and 8393RK; of twelve, eight shorter and one longer, nearest the 8324SB, 8329SB and four others (36 ft 8 in) and the 8421DB (41 ft 10 in).
- Exterior height, 12 ft: tallest of twelve, level with the 8392RL, 8393RK and 8421DB; next are the 8262RBS, 8263MBR and six others (11 ft 7 in).
- Grey tank, 131 gal: largest of twelve, level with the 8336BH, 8392RL and two others; next is the 8335SB (130 gal).
- Black tank, 53 gal: shared with the 8336BH, 8392RL and 8393RK; of twelve, seven smaller and one larger, nearest the 8324SB, 8329SB and three others (50 gal) and the 8421DB (106 gal).
Next to the 8393RK, the nearest lighter floorplan by dry weight, the 8391FK is 90 lb heavier by dry weight, has 5 lb more cargo capacity and has a tongue weight 215 lb heavier; the two publish the same length, exterior height, fresh tank, grey tank and black tank.
Next to the 8421DB, the nearest heavier floorplan by dry weight, the 8391FK is 850 lb lighter by dry weight, has 39 lb less cargo capacity, is 3 ft 2 in shorter and has a black tank 53 gal smaller; the two publish the same tongue weight, exterior height, fresh tank and grey tank.
02 Full specifications
Dimensions
- Exterior length
- 38' 8"
- Exterior height
- 12' 0"
- Exterior width
- 100"
Weights
- Dry / unit base weight (UVW)
- 10,409 lbs
- GVWR (max loaded)
- Not published by Forest River for this line
- Net cargo / payload (CCC)
- 2,087 lbs
- Hitch / tongue weight
- 1,385 lbs
Capacities
- Fresh water
- 54 gal
- Grey water
- 131 gal
- Black water
- 53 gal
Running gear
- Hitch type
- Bumper pull
- Axles
- Not published by Forest River
- Tires
- Not published by Forest River
Sleeping & layout
- Sleeps
- Not published by Forest River
- Awnings
- 19' & 11'
How these published figures sit against the rest of the catalogue: travel trailer tongue weight by size; fresh, grey and black tank sizes; camper trailer size chart.
Drawn to scale
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
03 The Rockwood Signature floorplan family
Signature is a travel trailer with fifth-wheel numbers. Dry weight across the five plans runs 9,858 to 11,259 lb and tongue weight runs 1,170 to 1,385 lb -- tongue figures to check against your hitch and truck ratings. Cargo capacity runs 1,518 to 2,126 lb, which is a smaller payload allowance than the lighter Ultra Lite plans offer despite roughly 3,000 lb more trailer. What the size buys instead is waste capacity: grey is 131 gallons on every plan and black runs 53 to 106, against 54 gallons of fresh throughout.
| Floorplan | Nominal | Dry weight (lb) | Cargo, CCC (lb) | Notable |
|---|---|---|---|---|
| 8336BH | 36' 8" | 9,858 | 1,518 | Signature Travel Trailers |
| 8392RL | 38' 8" | 10,304 | 2,092 | Signature Travel Trailers |
| 8393RK | 38' 8" | 10,319 | 2,082 | Signature Travel Trailers |
| 8391FK | 38' 8" | 10,409 | 2,087 | Signature Travel Trailers |
| 8421DB | 41' 10" | 11,259 | 2,126 | Signature Wide Body Travel Trailers |
Signature is the heaviest Rockwood travel-trailer grouping and the factory files its five 2027 floorplans under two headings, Signature Travel Trailers and Signature Wide Body Travel Trailers. All five publish dry weight, cargo capacity, tongue weight, all three exterior dimensions and all three tank capacities, and all five carry a factory floorplan description. No plan in the grouping publishes a GVWR, so loaded rating is shown as not published and is never derived. Forest River also builds a Signature fifth-wheel roster of eleven floorplans, which is catalogued separately and is not part of this travel-trailer grouping.
04 Notes on this floorplan
What Forest River does not publish for this line
Sleeping capacity, axle count, tire size and MSRP are not in Forest River’s specification channel for Rockwood Signature, so this page does not publish them and does not estimate them (how figures are verified).
There is no factory GVWR for this trailer
Forest River publishes dry weight, cargo capacity and tongue weight for every Rockwood Signature floorplan and publishes no GVWR for any of them. The factory's own glossary defines cargo capacity as GVWR minus UVW, which means the rating can be worked out - and a figure you worked out is not a figure the manufacturer published, so this page does not print one. Use the weight label on the trailer itself, which every Forest River unit carries.
Weigh it before you tow it
Forest River calls its unloaded weight an estimated average for a standard build, and options and dealer add-ons change it, so weigh your own trailer loaded the way you travel (how figures are verified).
05 How it compares
10,319 lbs dry against this plan's 10,409 lbs, a difference of 90 lbs.
11,259 lbs dry, 850 lbs more than this plan, and 2,126 lbs of cargo capacity against this one's 2,087 lbs.
2,730 lbs of cargo capacity, the highest of the 12 Rockwood Signature floorplans profiled here. If payload rather than length is the binding constraint, that is the plan to compare against.
06 Loading it for a trip
A full 54-gallon fresh tank is about 448 lb of water, 21% of the 8391FK’s 2,087 lb cargo capacity, leaving 1,639 lb. Across 12 Rockwood Signature floorplans the water share runs 16% to 30%, and 5 give up more than this one. Nearest on that share: Rockwood Signature 8392RL at 21% and Rockwood Signature 8393RK at 22%.
07 Where this floorplan sits
Closest sibling: the Rockwood Signature 8392RL, nearest on the published figures. It differs on 3 of the 7 fields both publish (this plan first): dry weight 10,409 lb vs 10,304 lb; cargo capacity 2,087 lb vs 2,092 lb; hitch weight 1,385 lb vs 1,305 lb. They match on length, fresh tank, grey tank and black tank.
| Rockwood Signature plans | This plan | Position, low to high | Range |
|---|---|---|---|
| Dry weight (lb) | 10,409 | 11 of 12 | 7,709–11,259 |
| Cargo capacity (lb) | 2,087 | 6 of 12 | 1,518–2,730 |
| Hitch weight (lb) | 1,385 | 11–12 of 12 | 1,057–1,385 |
| Length | 38 ft 8 in | 9–11 of 12 | 29 ft 11 in–41 ft 10 in |
| Grey tank (gal) | 131 | 8–12 of 12 | 80–131 |
| Black tank (gal) | 53 | 8–11 of 12 | 40–106 |
Either side of it by dry weight: Rockwood Signature 8393RK is 90 lb lighter (10,319 lb dry); Rockwood Signature 8421DB is 850 lb heavier (11,259 lb dry).
| Nearest Rockwood Signature siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Rockwood Signature 8391FK | 38 ft 8 in | — | 10,409 | — | 2,087 | 1,385 | 54 |
| Rockwood Signature 8392RL | 38 ft 8 in | — | 10,304 | — | 2,092 | 1,305 | 54 |
| Rockwood Signature 8393RK | 38 ft 8 in | — | 10,319 | — | 2,082 | 1,170 | 54 |
| Rockwood Signature 8337RL | 36 ft 8 in | — | 9,209 | — | 2,106 | 1,315 | 54 |
| Rockwood Signature 8336BH | 36 ft 8 in | — | 9,858 | — | 1,518 | 1,376 | 54 |
| Rockwood Signature 8324SB | 36 ft 8 in | — | 9,254 | — | 1,861 | 1,115 | 54 |
All 12 Rockwood Signature floorplans: Rockwood Signature line hub.
| Other lines, nearest by dry weight | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 8391FK | — | 10,409 | — | 38 ft 8 in |
| Puma Vista 38DEN | 12,434 | 10,434 | — | 40 ft 6 in |
| Jay Flight 401FLTS | 12,000 | 10,355 | 4 | 40 ft 4 in |
| Alta 3250KXT | — | 10,334 | — | 38 ft 5 in |
| Eagle 332CBOK | 11,995 | 10,490 | 6 | 39 ft 11 in |
| Aurora Destination Series 39FLTS | 11,823 | 10,323 | — | 42 ft 11 in |
| Zinger 390DB | — | 10,517 | 8 | 43 ft 1 in |
Against the 8391FK: the Puma Vista 38DEN is 25 lb heavier and 2 ft longer; the Jay Flight 401FLTS is 54 lb lighter and 2 ft longer; the Alta 3250KXT is 75 lb lighter.
08 Common questions about the 8391FK
How much can the 8391FK carry?
2,087 lb. A full fresh tank uses 448 lb of it.
What is the tongue weight of the 8391FK?
1,385 lb as published, 13% of the dry weight (median across 1,205 travel trailers here: 12%).
What are the tank capacities on the 8391FK?
Fresh 54, grey 131, black 53 gallons. Off hookups, fresh water runs out first.
How long is the 8391FK?
38' 8" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
10 of the 18 fields this catalogue tracks are published for the 8391FK. Not published: GVWR, 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 35 recall campaigns and 173 owner complaints (model years 2005 on) against the Rockwood & Flagstaff line (a recall and a complaint are not the same thing).
What to look at on a used one. Across the 173 complaints filed on this line the most-reported components are tires (22%), structure (17%) and wheels (17%).
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 Rockwood & Flagstaff line page.