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.

This floorplan carries its water comfortably. A full 98-gallon fresh tank is roughly 25% of the 3,300-pound cargo capacity, leaving the 320G with a usable gear budget even when you tow full.

The published dry pin weight of 2,300 pounds is 18% of this floorplan’s 13,100-pound dry weight. Fifth-wheel pin weight rides in the bed of the truck, so it comes off payload rather than off tow rating — and it rises with the trailer as you load it, not in proportion to what you put over the axles.

Nothing above changes the ceiling. Loaded to its 16,400-pound GVWR the 320G is towing 3,300 pounds more than its 13,100-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 98 gallons of fresh against 52 grey and 104 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 320G sits 5 of 8 in the Momentum line: 16,400 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 30G is 3,400 pounds lighter at 13,000 lb GVWR; and Momentum 344M is 2,600 pounds heavier at 19,000 lb GVWR.

Against the 320G: the Sabre 38RVHUNTER is 10 lb lighter and 8 ft longer and sleeps 1 more; the Blackthorn 3820DSL is 50 lb lighter and 6 ft longer; the Columbus 377DS is 80 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 fifth wheels 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 17 of them for the 320G. 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 size (a tire description is published, a size is not). 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 (96%) 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.