01 What makes it unique
Brinkley lists the 2027 Model Gx 4000x at 16,950 lb dry, a GVWR of 22,000 lb and a pin weight of 3,500 lb. Brinkley prints no cargo carrying capacity for it, so none is given here; the federal label inside the trailer carries one.
It is 45' 2" long and 13' 4" high. Brinkley prints its tanks as 150 gal fresh, 104 gal grey, 104 gal black.
Among the 2 Model Gx floorplans Brinkley’s Model Gx floorplan flyers (listed under model year 2027 in Brinkley’s own document library; the flyers print no year) lists with a published dry weight, it is number 2 from the lightest, in a range from 15,600 lb (Model Gx 3500x) to 16,950 lb (Model Gx 4000x). Every figure in that comparison is Brinkley’s, for the same model year.
Every number on this page was read on 6 Nov 2026 from Brinkley’s Model Gx floorplan flyers (listed under model year 2027 in Brinkley’s own document library; the flyers print no year); model year 2027 comes from where the maker files it on its own site, not from the document’s text.
How the 4000x differs from the other Model Gx floorplan. How these ranks are worked out.
Next to the 3500x, the nearest lighter floorplan by dry weight, the 4000x is 1,350 lb heavier by dry weight, has a GVWR 2,750 lb higher, has a pin weight 300 lb heavier and is 5 ft longer; the two publish the same exterior height, fresh tank, grey tank and black tank.
02 Full specifications
Dimensions
- Exterior length
- 45' 2"
- Exterior height
- 13' 4"
- Exterior width
- 101"
- Interior height
- Not published by Brinkley
Weights
- Dry / unit base weight (UVW)
- 16,950 lb
- GVWR (max loaded)
- 22,000 lb
- Net cargo / payload (CCC)
- Not published by Brinkley
- Hitch / pin weight
- 3,500 lb
Capacities
- Fresh water
- 150 gal
- Grey water
- 104 gal
- Black water
- 104 gal
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Brinkley
Sleeping & layout
- Sleeps
- Not published by Brinkley
- Model year source
- Brinkley RV Document Library (brinkleyrv.com/product-downloads/), row: Model_Year "2027", Model "Model Gx", Model_Type "Fifth Wheels", Floorplan "4000x", document "2027 Model Gx 4000x Floorplan Flyer"; file stored in maker year folder /Docs/Flyers/27/. The flyer text itself prints no model year.
- GVWR (as printed)
- 22,000 lbs. (Triple Axle)
- Gray Water Capacity (as printed)
- 104 gal. (True)
- Garage Length
- 17' 0"
- Garage Door Capacity
- 3,000 lbs.
- Garage Door Patio Capacity
- 1,500 lbs.
- Fuel Station Tank
- 60 gal. (30 + 30)
- Wheels & Tires
- 17.5" Load Range H (16-Ply)
- Insulation
- Floors/Ceiling/Front Cap R40, Walls R11
- Flyer heading (as printed)
- MODEL Gx 4000
- Flyer version (as printed)
- v.091726
- Weight basis (as printed)
- UVW / GVWR / Hitch Weight; flyer: "Optional equipment & props may be shown. All content is subject to change without notice. Please consult with your dealer for current information."
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
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 (22,000 lb) and the upper loaded pin estimate (5,500 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). The range starts at the published figure, because loaded is never lighter than that.
03 The Model Gx floorplan family
Brinkley’s Model Gx floorplan flyers (listed under model year 2027 in Brinkley’s own document library; the flyers print no year) lists 2 Model Gx floorplans; every one with a printed weight has a page here.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| Model Gx 3500x | 40' 2" | — | Profiled |
| Model Gx 4000x | 45' 2" | — | Profiled |
Brinkley’s Model Gx floorplan flyers (listed under model year 2027 in Brinkley’s own document library; the flyers print no year) lists 2 Model Gx floorplans. Every one with a printed weight has a page here.
04 Notes on this floorplan
What Brinkley does not publish for the Model Gx 4000x
Brinkley prints no cargo carrying capacity, 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
15,600 lb dry and 19,250 lb GVWR, against this model’s 16,950 lb and 22,000 lb.
07 Where this floorplan sits
Closest sibling: the Model Gx 3500x, nearest on the published figures. It differs on 4 of the 7 fields both publish (this plan first): length 45 ft 2 in vs 40 ft 2 in; dry weight 16,950 lb vs 15,600 lb; GVWR 22,000 lb vs 19,250 lb; hitch weight 3,500 lb vs 3,200 lb. They match on fresh tank, grey tank and black tank.
Either side of it by GVWR: Model Gx 3500x is 2,750 lb lighter (19,250 lb GVWR).
| Nearest Model Gx siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Model Gx 4000x | 45 ft 2 in | — | 16,950 | 22,000 | — | 3,500 | 150 |
| Model Gx 3500x | 40 ft 2 in | — | 15,600 | 19,250 | — | 3,200 | 150 |
All 2 Model Gx floorplans: Model Gx line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Model Gx 4000x | 22,000 | 16,950 | — | 45 ft 2 in |
| Model G 3250 | 22,000 | 17,300 | — | 37 ft 11 in |
| Seismic 415 | 22,000 | 16,590 | 6 | 46 ft 5 in |
| Momentum 394G | 22,500 | 16,400 | 7 | — |
| Cyclone 3913 | 21,000 | 15,435 | 8 | 46 ft 5 in |
| Nightfall 397NHD | 21,000 | 15,674 | — | 45 ft 0 in |
| Road Warrior 391 | 21,000 | 14,599 | 8 | 44 ft 10 in |
Against the Model Gx 4000x: the Model G 3250 is 7 ft shorter; the Seismic 415 is 1 ft longer; the Momentum 394G is 500 lb heavier.
08 Common questions about the Model Gx 4000x
How much does the Model Gx 4000x weigh?
16,950 lb dry; 22,000 lb GVWR, the most it may weigh loaded.
What is the pin weight of the Model Gx 4000x?
3,500 lb as published, 21% of the dry weight (median across 686 fifth wheels here: 19%).
What size tow vehicle does the Model Gx 4000x need?
A tow rating of at least 22,000 lb, plus payload for the loaded pin weight, passengers and cargo.
What are the tank capacities on the Model Gx 4000x?
Fresh 150, grey 104, black 104 gallons. Off hookups, fresh water runs out first.
How long is the Model Gx 4000x?
45' 2" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
9 of the 18 fields this catalogue tracks are published for the Model Gx 4000x. Not published: cargo capacity (CCC), interior height, sleeps, slide count, axle count, tire specification, awning, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: brinkleyrv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
No recall campaign or owner complaint in our NHTSA data names the Model Gx line. Read that as no result found, not as a clean record.
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 Model Gx line page.