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.

This floorplan carries its water comfortably. A full 90-gallon fresh tank is roughly 19% of the 3,861-pound cargo capacity, leaving the 30G with a usable gear budget even when you tow full.

The published dry tongue weight of 1,425 pounds is 16% of the 9,139-pound dry weight — at or above the top of the usual 10–15% band before you load anything. A nose-heavy dry figure eats truck payload directly, so budget the hitch load against your door-jamb sticker rather than against the tow rating.

Nothing above changes the ceiling. Loaded to its 13,000-pound GVWR the 30G is towing 3,861 pounds more than its 9,139-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 90 gallons of fresh against 78 grey and 39 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 30G sits 4 of 8 in the Momentum line: 13,000 pounds against a line that runs from 9,950 to 23,500 pounds. That position is the useful thing to know, because the plans immediately either side of it are the real alternatives.

Either side of it in the same line: Momentum 28MAV is 2,000 pounds lighter at 11,000 lb GVWR; and Momentum 320G is 3,400 pounds heavier at 16,400 lb GVWR.

Against the 30G: the Jay Flight 40FKDS is 6 ft longer and sleeps 3 fewer; the Cherokee Timberwolf 39DL is 95 lb heavier and 8 ft longer; the Cascade 39TNC is 140 lb heavier and 6 ft longer. Those are differences in the published numbers only — what they cost, how they are built and how they live are separate questions each of those pages answers on its own terms.

Those are the nearest travel trailers from other lines by weight — one per line, picked by proximity on that figure and nothing else. They are listed so the same tow vehicle can be checked against real alternatives, not because they are equivalent inside; layout, build and price diverge sharply across that group.

For scale, the Momentum floorplans profiled here run 5,542 to 18,114 pounds dry and 23 to 46 feet of exterior length across 8 plans. Where a floorplan falls in that spread usually says more about which vehicle can tow it, and which site it fits, than the layout name does.

Every profiled floorplan in this line, with the full weight table, is on the Momentum line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 16 of them for the 30G. The rest are not shown, because the alternative is reading a figure across from a sibling floorplan or from what the segment usually does — and a number nobody published is worth less than an admitted gap.

Not published for this floorplan: axle count, tire specification. If you find one of these in a manufacturer document for this plan, it belongs on this page.

The completeness figure at the foot of this page (100%) measures the same thing on the full field set: it is a measurement of how much this floorplan’s manufacturer publishes, not of how much research went into the page.

How every figure here was sourced and checked is set out on the methodology page.