01 What makes it unique
Bigfoot lists the 2500 Series 25B21FB at 4,553 lb dry and a GVWR of 7,500 lb. It prints no tongue weight for it. Bigfoot prints no cargo carrying capacity for it, so none is given here; the federal label inside the trailer carries one.
It is 21'-6" long and 8'-10" high. Bigfoot prints its tanks as 34 gal fresh, 27 gal grey, 22 gal black.
Among the 7 2500 Series floorplans Bigfoot’s 2500 Series model pages on bigfootrv.com (no model year stated) lists with a published dry weight, it is number 3 from the lightest, in a range from 3,360 lb (2500 Series 25B17.5FB) to 5,563 lb (2500 Series 25B25FB). Every figure in that comparison is Bigfoot’s, read from the same set of model pages.
Every number on this page was read on 6 Nov 2026 from Bigfoot’s own 2500 Series model pages on bigfootrv.com (no model year stated) for the 2500 Series 25B21FB, which names no model year; the figures are shown as the maker published them, and no year is claimed for them.
How the 25B21FB differs from the other six 2500 Series floorplans. Most distinctive first. How these ranks are worked out.
- Dry weight, 4,553 lb: shared with the 25B21FT; of seven, two lighter and three heavier, nearest the 25B21RB (4,308 lb) and the 25B25RQ and 25B25RT (4,863 lb).
- Length, 21 ft: shared with the 25B21FT and 25B21RB; of seven, one shorter and three longer, nearest the 25B17.5FB (17 ft) and the 25B25FB, 25B25RQ and 25B25RT (25 ft).
- Fresh tank, 34 gal: shared with the 25B21FT; of seven, two smaller and three larger, nearest the 25B17.5FB and 25B21RB (30 gal) and the 25B25FB, 25B25RQ and 25B25RT (45 gal).
- Grey tank, 27 gal: shared with the 25B21FT; of seven, two smaller and three larger, nearest the 25B21RB (22 gal) and the 25B25FB, 25B25RQ and 25B25RT (45 gal).
- Black tank, 22 gal: shared with the 25B21FT and 25B21RB; of seven, one smaller and three larger, nearest the 25B17.5FB (21 gal) and the 25B25FB, 25B25RQ and 25B25RT (45 gal).
Next to the 25B21RB, the nearest lighter floorplan by dry weight, the 25B21FB is 245 lb heavier by dry weight, has a fresh tank 4 gal larger and has a grey tank 5 gal larger; the two publish the same GVWR, length, exterior height, interior height and black tank.
Next to the 25B25RQ, the nearest heavier floorplan by dry weight, the 25B21FB is 310 lb lighter by dry weight, is 4 ft shorter, stands 1 ft lower, has a fresh tank 11 gal smaller, has a grey tank 18 gal smaller and has a black tank 23 gal smaller; the two publish the same GVWR and interior height.
On every figure compared here the 25B21FB publishes the same values as the 25B21FT, so on these numbers alone they cannot be told apart.
02 Full specifications
Dimensions
- Exterior length
- 21'-6"
- Exterior height
- 8'-10"
- Exterior width
- 8'-4"
- Interior height
- 6'-4"
Weights
- Dry / unit base weight (UVW)
- 4,553 lb
- GVWR (max loaded)
- 7,500 lb
- Net cargo / payload (CCC)
- Not published by Bigfoot
- Hitch / tongue weight
- Not published by Bigfoot
Capacities
- Fresh water
- 34 gal
- Grey water
- 27 gal
- Black water
- 22 gal
Running gear
- Hitch type
- Bumper pull
- Tire size
- ST225/75R15
Sleeping & layout
- Sleeps
- Not published by Bigfoot
- Detailed specifications heading (as printed)
- Detailed specifications for 25B21FB
- Series (as printed)
- 2500 Series
- Overall Length
- 21'-6" (6.55 m) (Does not include optional Front Cargo Box)
- Overall Height
- 8'-10" (2.69 m) (To top of the refrigerator vent)
- Axle Rating
- 2×3,500 lb (2×1,588 kg)
- LPG Capacity
- 2×30 lb (2×18 L)
- Water Heater
- 6 gal (23 L)
- Furnace
- 30,000 BTU
- Fridge
- 6 cu ft (169 L)
- Awning (standard features list, as printed)
- Electric 14' Awning
- Hitch Weight (as printed; lb and kg figures disagree)
- 490 lb (184 kg)
- Awning
- 14'
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.
Federal tire recalls naming this size. NHTSA’s recall file names ST225/75R15 in 2 tire recalls: 14T015000 (Dynamic Tire Corp., 2014; make TOWMAX STR; model ST); 17T014000 (Triangle Tire USA, 2017; make TRIANGLE; model TR643). A tire recall covers only the brands, lines and DOT date codes it lists, and this page does not know which brand of tire this trailer was built with, so read the brand and DOT code on your own sidewalls before relying on this list. Only 242 of NHTSA’s 788 tire recalls name a size in their summary, so a size with no match is not a clean record (NHTSA recall file, read 12 Oct 2026).
Drawn to scale
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
03 The 2500 Series floorplan family
Bigfoot’s 2500 Series model pages on bigfootrv.com (no model year stated) lists 7 2500 Series floorplans; every one with a printed weight has a page here.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 2500 Series 25B17.5FB | 17'-5" | — | Profiled |
| 2500 Series 25B21RB | 21'-6" | — | Profiled |
| 2500 Series 25B21FB | 21'-6" | — | Profiled |
| 2500 Series 25B21FT | 21'-6" | — | Profiled |
| 2500 Series 25B25RQ | 25'-6" | — | Profiled |
| 2500 Series 25B25RT | 25'-6" | — | Profiled |
| 2500 Series 25B25FB | 25'-6" | — | Profiled |
Bigfoot’s 2500 Series model pages on bigfootrv.com (no model year stated) lists 7 2500 Series floorplans. Every one with a printed weight has a page here.
04 Notes on this floorplan
What Bigfoot does not publish for the 2500 Series 25B21FB
Bigfoot prints no cargo carrying capacity, tongue weight, 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
4,308 lb dry and 7,500 lb GVWR, against this model’s 4,553 lb and 7,500 lb.
4,553 lb dry and 7,500 lb GVWR, against this model’s 4,553 lb and 7,500 lb.
06 Loading it for a trip
No source publishes a tongue weight for the 2500 Series 25B21FB, so its hitch load has to come from a scale ticket taken with the trailer hitched.
07 Where this floorplan sits
Closest sibling: the 2500 Series 25B21FT. The two publish identical figures on all 6 fields both carry (length, dry weight, GVWR, fresh tank, grey tank, black tank), so the published record does not tell them apart; what separates them is the floorplan itself.
| 2500 Series plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 7,500 | 2–7 of 7 | 4,300–7,500 |
| Dry weight (lb) | 4,553 | 3–4 of 7 | 3,360–5,563 |
| Length | 21 ft 0 in | 2–4 of 7 | 17 ft 0 in–25 ft 0 in |
| Fresh tank (gal) | 34 | 3–4 of 7 | 30–45 |
| Grey tank (gal) | 27 | 3–4 of 7 | 21–45 |
| Black tank (gal) | 22 | 2–4 of 7 | 21–45 |
Either side of it by GVWR: 2500 Series 25B17.5FB is 3,200 lb lighter (4,300 lb GVWR); 2500 Series 25B21FT matches it at 7,500 lb GVWR.
| Nearest 2500 Series siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| 2500 Series 25B21FB | 21 ft 0 in | — | 4,553 | 7,500 | — | — | 34 |
| 2500 Series 25B21FT | 21 ft 0 in | — | 4,553 | 7,500 | — | — | 34 |
| 2500 Series 25B21RB | 21 ft 0 in | — | 4,308 | 7,500 | — | — | 30 |
| 2500 Series 25B17.5FB | 17 ft 0 in | — | 3,360 | 4,300 | — | 315 | 30 |
| 2500 Series 25B25RQ | 25 ft 0 in | — | 4,863 | 7,500 | — | 610 | 45 |
| 2500 Series 25B25RT | 25 ft 0 in | — | 4,863 | 7,500 | — | 610 | 45 |
All 7 2500 Series floorplans: 2500 Series line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 2500 Series 25B21FB | 7,500 | 4,553 | — | 21 ft 0 in |
| Black Series HQ12 | 7,500 | 5,080 | 4 | 19 ft 0 in |
| Connect SE C271BHKSE | 7,500 | 6,370 | 9 | 32 ft 1 in |
| Coachmen Freedom Express Ultra Lite 245RKS | 7,500 | 5,980 | 4 | 28 ft 5 in |
| inTech O-V-R Expedition | 7,500 | 5,200 | 5 | 22 ft 4 in |
| Jay Feather 22BH | 7,500 | 5,565 | 7 | 28 ft 10 in |
| Jay Flight 236TH | 7,500 | 5,060 | 4 | 28 ft 4 in |
Against the 2500 Series 25B21FB: the Black Series HQ12 is 2 ft shorter; the Connect SE C271BHKSE is 11 ft longer; the Coachmen Freedom Express Ultra Lite 245RKS is 7 ft longer.
08 Common questions about the 2500 Series 25B21FB
How much does the 2500 Series 25B21FB weigh?
4,553 lb dry; 7,500 lb GVWR, the most it may weigh loaded.
What size tow vehicle does the 2500 Series 25B21FB need?
A tow rating of at least 7,500 lb, plus payload for the loaded tongue weight, passengers and cargo.
What are the tank capacities on the 2500 Series 25B21FB?
Fresh 34, grey 27, black 22 gallons. Off hookups, fresh water runs out first.
How long is the 2500 Series 25B21FB?
21'-6" 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 2500 Series 25B21FB. Not published: cargo capacity (CCC), hitch weight, sleeps, slide count, axle count, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: bigfootrv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 1 recall campaign against the 2500 Series line (a recall and a complaint are not the same thing).
Reports that name the 25B21FB
1 of those record name this floorplan specifically rather than the line as a whole.
| Type | Date | Reference | What it says |
|---|---|---|---|
| Recall | 3 Feb 2021 | 21V047000 | A gas leak can increase the risk of a fire. |
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 2500 Series line page.