2027 Grand Design Momentum G-Class320G

The 320G opens the G-Class fifth-wheel roster: thirty-six feet, three slides, an eleven-foot garage and a 2,300-pound dry pin — the lightest pin of any Momentum fifth wheel. It keeps the 101-inch wide-body Super Chassis and adds the G-Class running gear: MORryde CRE3000 suspension on upgraded axle hangers, a Rotoflex pin box, electric auto-leveling, 17.5-inch H-rated aluminum wheels and Grand Design's new Omega Frame. The walls are laminated aluminum at R-11 under a 5-inch radius wood-framed R-40 roof, and the garage sits behind a laminated aluminum ramp door rated R-7. The factory scopes this plan explicitly to heavy-duty 8,000-pound axles with ABS drum brakes.

Grand Design publishes 16,400 pounds of GVWR against 13,100 dry, leaving 3,300 pounds of payload, and a 30-gallon fuel station rather than the flagship's 60. Two things on this plan are worth stating exactly as the factory does rather than tidying up: the black tank is the larger one at 104 gallons against 52 gallons of grey — the reverse of the flagship Momentum's split, and published that way — and the second of the two awnings is listed as optional. At $127,910 it is, oddly, the most expensive G-Class fifth wheel on the MSRP list despite being the smallest; the bigger 394G lists for less. That is the factory's own price sheet, not a transcription error.

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 320G 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.

A full 98-gallon fresh tank is about 817 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 25% of the 320G’s 3,300 lb cargo capacity, leaving 2,483 lb (414 lb per rated berth). Across 4 Momentum fifth-wheel floorplans the water share runs 13% to 38%, and 1 gives up more than this one. Nearest on that share: Momentum 392M at 22% and Momentum 344M at 38%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).

Closest sibling: the Momentum 344M, nearest on the published figures. It differs on 8 of the 9 fields both publish (this plan first): length 36 ft 3 in vs 39 ft 11 in; dry weight 13,100 lb vs 15,910 lb; GVWR 16,400 lb vs 19,000 lb; cargo capacity 3,300 lb vs 3,090 lb; dry hitch weight 2,300 lb vs 3,500 lb; fresh tank 98 gal vs 140 gal; grey tank 52 gal vs 104 gal; black tank 104 gal vs 52 gal. They match on sleeps.

Either side of it by GVWR: Momentum 344M is 2,600 lb heavier (19,000 lb GVWR).

All 8 Momentum floorplans: Momentum line hub.

Against the 320G: the Blackthorn 3820DSL is 50 lb lighter and 6 ft longer; the Columbus 377DS is 80 lb heavier and 6 ft longer; the Montana 3531RE is 80 lb heavier and 2 ft longer and sleeps 2 fewer.

17 of the 18 fields this catalogue tracks are published for the 320G. Not published: axle count, tire size (a description is published, a size is not).

Sourcing rules: methodology.