01 What makes it unique
Brinkley lists the 2027 Model Gx 3500x at 15,600 lb dry, a GVWR of 19,250 lb and a pin weight of 3,200 lb. Brinkley prints no cargo carrying capacity for it, so none is given here; the federal label inside the trailer carries one.
It is 40' 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 1 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 3500x differs from the other Model Gx floorplan. How these ranks are worked out.
Next to the 4000x, the nearest heavier floorplan by dry weight, the 3500x is 1,350 lb lighter by dry weight, has a GVWR 2,750 lb lower, has a pin weight 300 lb lighter and is 5 ft shorter; the two publish the same exterior height, fresh tank, grey tank and black tank.
02 Full specifications
Dimensions
- Exterior length
- 40' 2"
- Exterior height
- 13' 4"
- Exterior width
- 101"
- Interior height
- Not published by Brinkley
Weights
- Dry / unit base weight (UVW)
- 15,600 lb
- GVWR (max loaded)
- 19,250 lb
- Net cargo / payload (CCC)
- Not published by Brinkley
- Hitch / pin weight
- 3,200 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 "3500x", document "2027 Model Gx 3500x Floorplan Flyer"; file stored in maker year folder /Docs/Flyers/27/. The flyer text itself prints no model year.
- GVWR (as printed)
- 19,250 lbs. (Tandem Axle)
- Gray Water Capacity (as printed)
- 104 gal. (True)
- Garage Length
- 11' 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 3500
- 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 (19,250 lb) and the upper loaded pin estimate (4,812 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 3500x
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
16,950 lb dry and 22,000 lb GVWR, against this model’s 15,600 lb and 19,250 lb.
07 Where this floorplan sits
Closest sibling: the Model Gx 4000x, nearest on the published figures. It differs on 4 of the 7 fields both publish (this plan first): length 40 ft 2 in vs 45 ft 2 in; dry weight 15,600 lb vs 16,950 lb; GVWR 19,250 lb vs 22,000 lb; hitch weight 3,200 lb vs 3,500 lb. They match on fresh tank, grey tank and black tank.
Either side of it by GVWR: Model Gx 4000x is 2,750 lb heavier (22,000 lb GVWR).
| Nearest Model Gx siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Model Gx 3500x | 40 ft 2 in | — | 15,600 | 19,250 | — | 3,200 | 150 |
| Model Gx 4000x | 45 ft 2 in | — | 16,950 | 22,000 | — | 3,500 | 150 |
All 2 Model Gx floorplans: Model Gx line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Model Gx 3500x | 19,250 | 15,600 | — | 40 ft 2 in |
| Riverstone 38BMB | 19,250 | 17,186 | — | 39 ft 7 in |
| Pinnacle 39DSDB | 19,200 | 16,360 | 8 | — |
| Escalade Sportster 41IKS | 19,000 | 14,298 | — | 41 ft 11 in |
| Influence 3804DS | 19,000 | 14,800 | — | — |
| Momentum 344M | 19,000 | 15,910 | 6 | — |
| North Point 375TBDB | 19,000 | 15,735 | 9 | — |
Against the Model Gx 3500x: the Pinnacle 39DSDB is 50 lb lighter; the Escalade Sportster 41IKS is 250 lb lighter and 2 ft longer.
08 Common questions about the Model Gx 3500x
How much does the Model Gx 3500x weigh?
15,600 lb dry; 19,250 lb GVWR, the most it may weigh loaded.
What is the pin weight of the Model Gx 3500x?
3,200 lb as published, 21% of the dry weight (median across 686 fifth wheels here: 19%).
What size tow vehicle does the Model Gx 3500x need?
A tow rating of at least 19,250 lb, plus payload for the loaded pin weight, passengers and cargo.
What are the tank capacities on the Model Gx 3500x?
Fresh 150, grey 104, black 104 gallons. Off hookups, fresh water runs out first.
How long is the Model Gx 3500x?
40' 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 3500x. 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.