01 What makes it unique
The Momentum G-Class 350G is a fifth-wheel toy hauler 39 ft 9 in long with a 14 ft 6 in garage, on two axles with three 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 13,400 lb, a GVWR of 18,000 lb and a pin weight of 2,600 lb. It publishes no cargo carrying capacity, so none is printed or computed here. Tanks are 98 gal fresh, 52 gal grey and 104 gal black, and it sleeps 5.
Grand Design’s page names the 320G and 351MS as comparison floorplans.
How the 350G differs from the other eleven Momentum fifth wheels. Most distinctive first. Each rank counts only the siblings that publish that field, and a figure most of them share is left out.
- Pin weight, 2,600 lb: second-lightest of twelve, between the 320G (2,300 lb) and the 325G (2,638 lb).
- Dry weight, 13,400 lb: third-lightest of twelve, between the 320G (13,100 lb) and the 363G (14,250 lb).
- Length, 39 ft 9 in: third-shortest of twelve, between the 320G (36 ft 3 in) and the 344M and 351MS (39 ft 11 in).
- Pin weight as a share of dry weight, 19.4%: fourth-smallest of twelve, between the 351MS (19%) and the 395MT and 396DB (19.7%).
- Sleeping capacity, 5: smallest of twelve, level with the 399M; next are the 320G, 325G and three others (6).
- GVWR, 18,000 lb: shared with the 325G; of twelve, one lower and nine higher, nearest the 320G (16,400 lb) and the 344M, 351MS and 363G (19,000 lb).
- Fresh tank, 98 gal: smallest of twelve, level with the 320G, 363G and 394G; next are the 325G, 344M and six others (140 gal).
- Grey tank, 52 gal: smallest of twelve, level with the 320G, 351MS and 381MS; next is the 395MT (78 gal).
- Black tank, 104 gal: largest of twelve, level with the 320G, 351MS and 381MS; next is the 395MT (78 gal).
Next to the 320G, the nearest lighter floorplan by dry weight, the 350G is 300 lb heavier by dry weight, has a GVWR 1,600 lb higher, has a pin weight 300 lb heavier, is 3 ft 6 in longer and sleeps one fewer; the two publish the same exterior height, interior height, fresh tank, grey tank, black tank and slide-out count.
Next to the 363G, the nearest heavier floorplan by dry weight, the 350G is 850 lb lighter by dry weight, has a GVWR 1,000 lb lower, has a pin weight 500 lb lighter, is 1 ft 10 in shorter, has a grey tank 50 gal smaller, has a black tank 52 gal larger, sleeps four fewer and has one more slide-out; the two publish the same exterior height and fresh tank.
02 Full specifications
Dimensions
- Exterior length
- 39 ft 9 in
- Exterior width
- 8 ft 5 in
- Width, slides out
- 13 ft 4 in
- Exterior height
- 13 ft 6 in
- Interior height
- 8 ft 7 in
- Garage / flex length
- 14 ft 6 in
Weights
- Dry / unit base weight (UVW)
- 13,400 lbs
- GVWR (max loaded)
- 18,000 lbs
- Net cargo / payload
- Not published by Grand Design
- Hitch / pin weight
- 2,600 lbs
Capacities
- Fresh water
- 98 gal
- Grey water
- 52 gal
- Black water
- 104 gal
- LP gas
- 60 lbs · 2 tanks
- Refrigerator
- 15 cu. ft.
Construction
- Chassis
- 101″ Wide-Body Super Chassis · new Omega Frame
- Sidewalls
- Laminated aluminum framed (R-11)
- Roof
- 5″ radius wood framed (R-40*) · Worry-Free composite, lifetime warranty
- Ramp door
- Laminated aluminum framed (R-7)
- Slide rooms
- Laminated aluminum framed roof and end walls (R-7)
Running gear
- Hitch
- Fifth-wheel (in-bed) · Rotoflex pin box
- Suspension
- MORryde CRE3000 · upgraded axle hangers
- Leveling
- Electric auto-leveling
- Tires
- Heavy-duty H-rated · 17.5″ H-rated aluminum wheels
- Spare
- Full-sized spare tire and carrier
- Tire size
- 17.5
- GAWR, as Grand Design lists it
- 14,000 lbs
Garage
- Garage / flex length
- 14 ft 6 in
- Ramp
- Laminated aluminum framed rear ramp door (R-7)
- Tie-downs
- 2,500 lb tie-downs anchored into the chassis
- Fuel station
- 30 gal
Galley & systems
- Refrigerator
- 15 cu. ft. 12-volt
- Air conditioning
- 30,000 BTU
- Furnace
- 35,000 BTU
- Water heater
- Tankless
- Solar
- Standard solar package · 39 AMP charge controller · panel wattage not asserted*
- Shower
- 48 X 30
Sleeping & layout
- Sleeps
- 5
- Slides
- 3
- Awnings
- 2
- Hitch type
- Fifth-wheel (in-bed)
- Primary bed
- 60 X 80 Queen Bed
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 (18,000 lb) and the upper loaded pin estimate (4,500 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).
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 350G 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 |
|---|---|---|---|---|---|---|
| 325G | Momentum G-Class | 5W | 35′ 6″ | 15 ft | 6 | 15 ft garage, sleeps 6, 2 slides |
| 320G | Momentum G-Class | 5W | 36′ 3″ | 11 ft | 6 | Entry G-Class fifth wheel — lowest GVWR of the six |
| 350G | Momentum G-Class | 5W | 39′ 9″ | 14 ft 6 in | 5 | 14 ft 6 in garage, sleeps 5, 3 slides |
| 363G | Momentum G-Class | 5W | 41′ 7″ | 13 ft* | 9 | 13 ft* garage, sleeps 9, 2 slides |
| 394G | Momentum G-Class | 5W | 44′ 11″ | 15 ft* | 7 | Top G-Class GVWR, biggest G-Class payload, triple awning |
The Momentum G-Class fifth wheel sits below the full-size Momentum — the same 101-inch wide-body idea on MORryde CRE3000 suspension and a Rotoflex pin box, with a 30-gallon fuel station and prices roughly forty thousand dollars under the flagship. Pin weights are factory dry figures and climb with cargo. Additional G-Class fifth-wheel floorplans are catalogued on the line hub.
04 Notes on this floorplan
14 ft 6 in garage, 30-gallon fuel station
Garage / flex length and fuel station as printed on the 350G page.
Pin 2,600 lb on 13,400 lb UVW
Grand Design’s pin weight is 19.4% of its unloaded weight; the loaded figure is higher.
30,000 BTU A/C, 35,000 BTU furnace
Climate equipment as Grand Design lists it for the 350G.
98 fresh / 52 grey / 104 black
Tank capacities in gallons, from the 350G page.
05 How it compares
Named by Grand Design’s 350G page as a comparison floorplan: UVW 13,100 lb, GVWR 16,400 lb, 36 ft 3 in.
Named by Grand Design’s 350G page as a comparison floorplan: UVW 15,760 lb, GVWR 19,000 lb, 39 ft 11 in.
Every current Momentum floorplan, all four rosters, side by side.
07 Where this floorplan sits
Closest sibling: the Momentum 320G, nearest on the published figures. It differs on 5 of the 8 fields both publish (this plan first): length 39 ft 9 in vs 36 ft 3 in; sleeps 5 vs 6; dry weight 13,400 lb vs 13,100 lb; GVWR 18,000 lb vs 16,400 lb; hitch weight 2,600 lb vs 2,300 lb. They match on fresh tank, grey tank and black tank.
| Momentum fifth-wheel plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 18,000 | 2–3 of 12 | 16,400–23,500 |
| Dry weight (lb) | 13,400 | 3 of 12 | 12,603–19,170 |
| Hitch weight (lb) | 2,600 | 2 of 12 | 2,300–3,760 |
| Length | 39 ft 9 in | 3 of 12 | 35 ft 6 in–46 ft 4 in |
| Fresh tank (gal) | 98 | 1–4 of 12 | 98–140 |
| Grey tank (gal) | 52 | 1–4 of 12 | 52–104 |
| Black tank (gal) | 104 | 9–12 of 12 | 52–104 |
| Sleeps | 5 | 1–2 of 12 | 5–9 |
Either side of it by GVWR: Momentum 325G matches it at 18,000 lb GVWR; Momentum 344M is 1,000 lb heavier (19,000 lb GVWR).
| Nearest Momentum fifth-wheel siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Momentum 350G | 39 ft 9 in | 5 | 13,400 | 18,000 | — | 2,600 | 98 |
| Momentum 320G | 36 ft 3 in | 6 | 13,100 | 16,400 | 3,300 | 2,300 | 98 |
| Momentum 351MS | 39 ft 11 in | 6 | 15,760 | 19,000 | — | 3,000 | 140 |
| Momentum 381MS | 43 ft 11 in | 6 | 17,722 | 23,500 | — | 3,726 | 140 |
| Momentum 325G | 35 ft 6 in | 6 | 12,603 | 18,000 | — | 2,638 | 140 |
| Momentum 363G | 41 ft 7 in | 9 | 14,250 | 19,000 | — | 3,100 | 98 |
All 24 Momentum floorplans: Momentum line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 350G | 18,000 | 13,400 | 5 | 39 ft 9 in |
| Cedar Creek 381MUD | 18,000 | 15,429 | 8 | 43 ft 5 in |
| Influence 3003RL | 18,000 | 12,500 | 4 | 34 ft 11 in |
| North Point 383FLRB | 18,000 | 14,840 | 6 | 42 ft 2 in |
| Paradigm 375RD | 18,000 | 14,771 | 5 | 41 ft 9 in |
| Puma Grand Mesa 395FKL | 18,000 | 14,929 | — | 42 ft 7 in |
| Bighorn 38RE | 17,995 | 15,275 | 4 | 42 ft 6 in |
Against the 350G: the Cedar Creek 381MUD is 4 ft longer and sleeps 3 more; the Influence 3003RL is 5 ft shorter and sleeps 1 fewer; the North Point 383FLRB is 2 ft longer and sleeps 1 more.
08 Common questions about the 350G
How much does the 350G weigh?
13,400 lb dry; 18,000 lb GVWR, the most it may weigh loaded.
What is the pin weight of the 350G?
2,600 lb as published, 19% of the dry weight (median across 411 fifth wheels here: 19%).
What size tow vehicle does the 350G need?
A tow rating of at least 18,000 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the 350G sleep?
It is rated to sleep 5. 10 of the 12 Momentum fifth-wheel floorplans that publish a count sleep more.
What are the tank capacities on the 350G?
Fresh 98, grey 52, black 104 gallons. Off hookups, fresh water runs out first.
How long is the 350G?
39 ft 9 in overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
15 of the 18 fields this catalogue tracks are published for the 350G. Not published: cargo capacity (CCC), axle count, tire size (a description is published, a size is not).
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%).
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.