01 What makes it unique
The Momentum G-Class 31G is a travel-trailer toy hauler 35 ft 11 in long with a 13 ft garage, on two axles with two slide-outs and a 30-gallon fuel station. It is on Grand Design’s Momentum G-Class roster for 2027.
Grand Design’s page lists an unloaded vehicle weight of 9,700 lb, a GVWR of 13,000 lb and a tongue weight of 1,572 lb. It publishes no cargo carrying capacity, so none is printed or computed here. Tanks are 90 gal fresh, 37 gal grey and 76 gal black, and it sleeps 6.
Grand Design’s page names the 29GS and 25G as comparison floorplans.
How the 31G differs from the other eleven Momentum travel trailers. Most distinctive first. Each rank counts only the siblings that publish that field, and a figure most of them share is left out.
- Tongue weight, 1,572 lb: heaviest of twelve; next are the 27G and 29GS (1,500 lb).
- Grey tank, 37 gal: smallest of twelve; next are the 17MAV, 21G and five others (74 gal).
- Black tank, 76 gal: largest of twelve; next are the 21G, 25G and three others (39 gal).
- Dry weight, 9,700 lb: second-heaviest of twelve, between the 30G (9,139 lb) and the 29GS (9,720 lb).
- Length, 35 ft 11 in: second-longest of twelve, between the 30G (34 ft 10 in) and the 30MAV (36 ft 11 in).
- Tongue weight as a share of dry weight, 16.2%: sixth-largest of twelve, between the 22MAV (16%) and the 25G (16.3%).
- Slide-out count, 2: most of eight, level with the 25G, 29GS and 30G; next are the 21G, 27G and two others (1).
- GVWR, 13,000 lb: highest of twelve, level with the 25G, 27G and two others; next is the 30MAV (12,000 lb).
- Interior height, 7 ft 7 in: shared with the 21G, 25G and 30G; of nine, four lower and one taller, nearest the 17MAV, 22MAV and two others (7 ft) and the 27G (8 ft 7 in).
- Exterior height, 12 ft 4 in: tallest of twelve, level with the 21G, 25G and three others; next are the 17MAV, 22MAV and four others (12 ft 2 in).
Next to the 30G, the nearest lighter floorplan by dry weight, the 31G is 561 lb heavier by dry weight, has a tongue weight 147 lb heavier, is 1 ft 1 in longer, has a grey tank 41 gal smaller, has a black tank 37 gal larger and sleeps one fewer; the two publish the same GVWR, exterior height, interior height, fresh tank and slide-out count.
Next to the 29GS, the nearest heavier floorplan by dry weight, the 31G is 20 lb lighter by dry weight, has a tongue weight 72 lb heavier, is 1 ft 5 in longer, has a grey tank 41 gal smaller and has a black tank 37 gal larger; the two publish the same GVWR, exterior height, fresh tank, sleeping capacity and slide-out count.
02 Full specifications
Dimensions
- Exterior length
- 35 ft 11 in
- Exterior width
- 8 ft 5 in
- Width, slides out
- 14 ft 4 in
- Exterior height
- 12 ft 4 in
- Interior height
- 7 ft 7 in
- Garage / flex length
- 13 ft
Weights
- Dry / unit base weight (UVW)
- 9,700 lbs
- GVWR (max loaded)
- 13,000 lbs
- Net cargo / payload
- Not published by Grand Design
- Hitch / tongue weight
- 1,572 lbs
Capacities
- Fresh water
- 90 gal
- Grey water
- 37 gal
- Black water
- 76 gal
- LP gas
- 40 lbs · 2 tanks
- Refrigerator
- 8 cu. ft.
Construction
- Sidewalls
- Laminated aluminum framed (R-7)
- Roof
- 5″ radius wood framed (R-40*) · double-insulated roof and front cap
- Ramp door
- Laminated aluminum framed (R-12)
- Front cap
- Fiberglass w/ paint · 48″ LED front cap lighting
- Underbelly
- Heated and enclosed w/ suspended tanks
Running gear
- Hitch
- Bumper pull
- Wheel wells
- None — flat garage floor
- Spare
- Full-sized spare tire and carrier
- Roof access
- Folding roof ladder · walk-on roof
- Tire size
- ST235/80R16 LRE
- GAWR, as Grand Design lists it
- 12,000 lbs
Garage
- Garage / flex length
- 13 ft
- Ramp
- Full-sized rear ramp door · rear-ramp loading lights w/ back-up function
- Tie-downs
- 2,500 lb tie-downs anchored into the chassis
- Fuel station
- 30 gal
Galley & systems
- Refrigerator
- 8 cu. ft. 12-volt
- Air conditioning
- 28,500 BTU
- Furnace
- 30,000 BTU
- Water heater
- Tankless
- Solar
- 220W roof-mounted panel · 30 AMP controller
- Shower
- 27 X 36
Sleeping & layout
- Sleeps
- 6
- Slides
- 2
- Awnings
- 1
- Hitch type
- Bumper pull
- Primary bed
- 60 X 80 Queen Bed
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.
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 (13,000 lb) and the upper loaded tongue estimate (1,950 lb, a rule of thumb). Your vehicle’s placard and the trailer’s own weight label govern.
Loaded range: 10–15% of GVWR on the tongue, 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 Momentum floorplan family
Momentum is Grand Design's toy-hauler family, and it spans four rosters across both tow types. The full-size Momentum fifth wheel is the flagship — a 101-inch wide-body coach on MORryde independent suspension with disc brakes, carrying a 60-gallon dual fuel station. The Momentum G-Class fifth wheel sits below it on MORryde CRE3000 suspension and a Rotoflex pin box with a 30-gallon fuel station, and the G-Class travel trailer puts that same garage behind a bumper pull. The Momentum MAV is the compact end — the lightest and cheapest way into a Momentum garage, and the one roster with no fuel station at all. The 31G on this page is highlighted; each other profiled plan links to its own page. The full MY2027 catalogue runs to 28 floorplans across the four rosters; eight are profiled in depth here and the rest are catalogued on the line hub with their weights.
| Floorplan | Roster | Type | Length | Garage | Sleeps | Notable |
|---|---|---|---|---|---|---|
| 21G | Momentum G-Class | TT | 26′ 11″ | 14 ft* | 6 | Entry G-Class trailer — only single-slide, lowest GVWR |
| 25G | Momentum G-Class | TT | 30′ 11″ | 13 ft 6 in | 6 | 13 ft 6 in garage, sleeps 6, 2 slides |
| 27G | Momentum G-Class | TT | 32′ 3″ | 14 ft 1 in | 6 | 14 ft 1 in garage, sleeps 6, 1 slide |
| 30G | Momentum G-Class | TT | 34′ 10″ | 20 ft 7 in | 7 | Longest garage in the whole Momentum family |
| 31G | Momentum G-Class | TT | 35′ 11″ | 13 ft | 6 | 13 ft garage, sleeps 6, 2 slides |
| 29GS | Momentum G-Class | TT | 34′ 6″ | 11 ft* | 6 | 11 ft* garage, sleeps 6, 2 slides |
The Momentum G-Class travel trailer brings the G-Class garage to a bumper-pull, for buyers who want a real toy hauler without an in-bed hitch. Laminated aluminum walls, a full-sized rear ramp door, a flat no-wheel-well garage floor and a 30-gallon fuel station are standard across the roster. Tongue weights are factory dry figures — weigh the loaded trailer and confirm against your vehicle's door-jamb placard. Additional G-Class travel-trailer floorplans are catalogued on the line hub.
04 Notes on this floorplan
13 ft garage, 30-gallon fuel station
Garage / flex length and fuel station as printed on the 31G page.
Tongue 1,572 lb on 9,700 lb UVW
Grand Design’s tongue weight is 16.2% of its unloaded weight; the loaded figure is higher.
28,500 BTU A/C, 30,000 BTU furnace
Climate equipment as Grand Design lists it for the 31G.
90 fresh / 37 grey / 76 black
Tank capacities in gallons, from the 31G page.
05 How it compares
Named by Grand Design’s 31G page as a comparison floorplan: UVW 9,720 lb, GVWR 13,000 lb, 34 ft 6 in.
Named by Grand Design’s 31G page as a comparison floorplan: UVW 8,600 lb, GVWR 13,000 lb, 30 ft 11 in.
Every current Momentum floorplan, all four rosters, side by side.
07 Where this floorplan sits
Closest sibling: the Momentum 29GS, nearest on the published figures. It differs on 5 of the 8 fields both publish (this plan first): length 35 ft 11 in vs 34 ft 6 in; dry weight 9,700 lb vs 9,720 lb; hitch weight 1,572 lb vs 1,500 lb; grey tank 37 gal vs 78 gal; black tank 76 gal vs 39 gal. They match on sleeps, GVWR and fresh tank.
| Momentum travel-trailer plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 13,000 | 8–12 of 12 | 9,950–13,000 |
| Dry weight (lb) | 9,700 | 11 of 12 | 5,542–9,720 |
| Hitch weight (lb) | 1,572 | 12 of 12 | 873–1,572 |
| Length | 35 ft 11 in | 11 of 12 | 22 ft 11 in–36 ft 11 in |
| Grey tank (gal) | 37 | 1 of 12 | 37–78 |
| Black tank (gal) | 76 | 12 of 12 | 37–76 |
| Sleeps | 6 | 4–11 of 12 | 2–7 |
Either side of it by GVWR: Momentum 30G matches it at 13,000 lb GVWR.
| Nearest Momentum travel-trailer siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Momentum 31G | 35 ft 11 in | 6 | 9,700 | 13,000 | — | 1,572 | 90 |
| Momentum 29GS | 34 ft 6 in | 6 | 9,720 | 13,000 | — | 1,500 | 90 |
| Momentum 27G | 32 ft 3 in | 6 | 8,650 | 13,000 | — | 1,500 | 90 |
| Momentum 30G | 34 ft 10 in | 7 | 9,139 | 13,000 | 3,861 | 1,425 | 90 |
| Momentum 30MAV | 36 ft 11 in | 6 | 8,400 | 12,000 | — | 1,400 | 90 |
| Momentum 25G | 30 ft 11 in | 6 | 8,600 | 13,000 | — | 1,400 | 90 |
All 24 Momentum floorplans: Momentum line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 31G | 13,000 | 9,700 | 6 | 35 ft 11 in |
| Jay Flight 40FKDS | 13,000 | 10,510 | 4 | 41 ft 0 in |
| Cherokee Timberwolf 39DL | 13,095 | 10,778 | — | 42 ft 8 in |
| Vengeance Rogue 25L141 | 12,900 | 8,189 | — | 32 ft 8 in |
| Cascade 39TNC | 13,140 | 8,885 | — | 40 ft 7 in |
| Zinger 390DB | 13,200 | 10,517 | 8 | 43 ft 1 in |
| Puma Vista 38VFL | 13,214 | 11,414 | — | 40 ft 3 in |
Against the 31G: the Jay Flight 40FKDS is 5 ft longer and sleeps 2 fewer; the Cherokee Timberwolf 39DL is 95 lb heavier and 7 ft longer; the Vengeance Rogue 25L141 is 100 lb lighter and 3 ft shorter.
08 Common questions about the 31G
How much does the 31G weigh?
9,700 lb dry; 13,000 lb GVWR, the most it may weigh loaded.
What is the tongue weight of the 31G?
1,572 lb as published, 16% of the dry weight (median across 1,227 travel trailers here: 12%).
What size tow vehicle does the 31G need?
A tow rating of at least 13,000 lb, plus payload for the loaded tongue weight, passengers and cargo.
How many people does the 31G sleep?
It is rated to sleep 6. 1 of the 12 Momentum travel-trailer floorplans that publish a count sleep more.
What are the tank capacities on the 31G?
Fresh 90, grey 37, black 76 gallons. Off hookups, fresh water runs out first.
How long is the 31G?
35 ft 11 in overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
16 of the 18 fields this catalogue tracks are published for the 31G. Not published: cargo capacity (CCC), axle count.
Sourcing rules: methodology.
10 Manuals & documents
Sources: granddesignrv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 19 recall campaigns and 201 owner complaints (model years 2005 on) against the Momentum line. They are counted separately: a recall is a confirmed defect with a remedy, a complaint one owner’s unverified account.
What to look at on a used one. Across the 201 complaints filed on this line the most-reported components are structure (41%), unknown or other (19%) and suspension (10%).
Reports that name the 31G
1 of those record name this floorplan specifically rather than the line as a whole.
| Type | Date | Reference | What it says |
|---|---|---|---|
| Complaint | 18 May 2024 | ODI 11589433 | There are hairline cracks in the frame / Axle hanger(s), throughout the entire inside floor there are drops / gaps when a level is put down of a minimum of 1/8" - showing symptoms of frame… |
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 Momentum line page.