2027 Grand Design Momentum G-Class30G

The 30G carries the biggest cargo box Grand Design builds into a Momentum, fifth wheel or trailer: twenty feet seven inches, three and a half feet longer than the flagship 392M's seventeen-foot garage, in a trailer that weighs 9,139 pounds dry. That is the whole argument for this plan. It sleeps seven on two slides, gets a king bed as standard where most of the roster gets a 60x80 queen, and runs 28,500 BTU of air conditioning. The G-Class trailer standards are all here: a full-sized rear ramp door, no wheel wells in the garage, 2,500-pound chassis-anchored tie-downs, rear-ramp loading lights and the 30-gallon fuel station with interior and exterior gauges.

The published weights give 13,000 pounds of GVWR against 9,139 dry, so payload is 3,861 pounds, with a 1,425-pound dry tongue. Read the garage figure and the payload figure together: twenty feet of floor will happily accept more than 3,861 pounds of machinery, and the trailer will not tell you when you have passed the line. The tongue is the other constraint — at 1,425 pounds dry it is a three-quarter-ton conversation once loaded, not a half-ton one.

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 30G 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 90-gallon fresh tank is about 751 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 19% of the 30G’s 3,861 lb cargo capacity, leaving 3,110 lb (444 lb per rated berth). Across 4 Momentum travel-trailer floorplans the water share runs 17% to 28%, and 2 give up more than this one. Nearest on that share: Momentum 17MAV at 17% and Momentum 21G at 20%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).

Closest sibling: the Momentum 28MAV, nearest on the published figures. It differs on 8 of the 9 fields both publish (this plan first): length 34 ft 10 in vs 33 ft 11 in; sleeps 7 vs 6; dry weight 9,139 lb vs 8,300 lb; GVWR 13,000 lb vs 11,000 lb; cargo capacity 3,861 lb vs 2,700 lb; dry hitch weight 1,425 lb vs 1,200 lb; grey tank 78 gal vs 74 gal; black tank 39 gal vs 37 gal. They match on fresh tank.

Either side of it by GVWR: Momentum 28MAV is 2,000 lb lighter (11,000 lb GVWR).

All 8 Momentum floorplans: Momentum line hub.

Against the 30G: the Jay Flight 40FKDS is 6 ft longer and sleeps 3 fewer; the Eagle 319MLOK is 5 lb lighter and 1 ft longer; the Cherokee Timberwolf 39DL is 95 lb heavier and 8 ft longer.

16 of the 18 fields this catalogue tracks are published for the 30G. Not published: axle count, tire specification.

Sourcing rules: methodology.