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Grand Design Momentum 351MS

Fifth wheelbuilt 2019– (in production)Mixed build tierFindable on the used market
WHAT ONE COSTS
$167,600MSRP today

Still in production. A used 2023 would run roughly $98,900.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~17,728 lbestimated as towed, for 2 people

dry weight 15,760 lb + fresh water (140 gal, full) 1,168 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.

You want a tow rating around19,700 lb (10% margin)
GVWR (the sticker maximum)19,000 lb
Tongue weight, loaded~3,375 lb (19%)
WHICH TOW VEHICLES IT FITS: 18 OF 95

Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin, per model year, because the 351MS's published weights changed mid-run. Fifth wheels also need a pickup bed and are held to the fifth-wheel rating where published.

VEHICLETOW RATINGVERDICT
Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-2622,500 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-2318,510 lb2019–20 model years fit
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-1918,100 lb2019–20 model years fit
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '20-2636,000 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '11-1923,300 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-2222,800 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-1918,000 lb2019–20 model years fit
Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-2623,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '17-1932,500 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '20-2237,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-1621,600 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2638,000 lbfits, loaded, with 10% margin
Ford F-450 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2640,000 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins HO) '19-2620,000 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins) '11-1817,980 lb2019–20 model years fit
Ram 3500 (6.7 Cummins DRW, gooseneck) '13-1831,210 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '25-2636,610 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '19-2437,090 lbfits, loaded, with 10% margin
The 77it doesn't fit

These verdicts assume 2 people aboard with typical gear. See the margin for your truck and your crew →

THE SPECS
Length39.9 ft
Height (incl. A/C)13.5 ft
Width8.4 ft
Interior height8.4 ft
GVWR19,000 lb
Dry weight15,760 lb
Dry tongue weight3,000 lb
Sleeps6
Slide-outs3
Axles2
Fresh water140 gal
Grey water52 gal
Black water104 gal
Solar (standard)330 W

A missing row means the maker never published that figure: unknown, not zero.

WHERE PEOPLE SLEEP
  • 1× Front queen bed with under-bed storage (king available)(Permanent)60×80
  • 1× P2K electric lift bed over the 11-foot garage(Stow-away)60×80
  • 2× Garage benches / folding sofas(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Grand Design (Mixed tier): Grand Design's toy hauler family, spanning four sub-series: the flagship M-Class fifth wheels (the plain M/MS/TH codes), the lighter G-Class fifth wheels (3xxG), G-Class travel trailers (2xG/3xG), and the entry MAV travel trailers. The premium fifth wheels are laminated aluminum-cage coaches on par with Solitude; MAV is a lighter traditional build, which is why the line as a whole reads mixed rather than uniformly better.

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
2019–2016,800 lb13,600 lb$167,621
202419,000 lb14,700 lb$126,355
202619,000 lb14,700 lb$149,371
  • 2019Introduced as the 351M: 38' 9", 16,800 lb GVWR, 13,600 lb dry
  • 2021Renamed 351MS
  • 2024GVWR up to 19,000 lb, dry 14,700 lb; MSRP $126,355
  • 2026MSRP $149,371 at 40' 6"
  • 2027Momentum M-Class folded back under the Momentum badge; dry 15,760 lb, pin 3,000 lb; MSRP $167,621
FINDING ONE

Findable: a few listed nationwide most weeks. Why: 8-year production run; still in production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Substituted for the requested 350M, which Grand Design never built — 351MS is the M-Class volume floorplan and the closest real match. The MSRP has climbed roughly a third since 2024, which is the story here.

OTHER MOMENTUM FLOORPLANS
17MAV · 9,950 lb · sleeps 221G · 11,000 lb · sleeps 622MAV · 9,950 lb · sleeps 523G · 13,000 lb · sleeps 624MAV · 11,000 lb · sleeps 325G · 13,000 lb · sleeps 627G · 13,000 lb · sleeps 627MAV · 11,000 lb · sleeps 628G · 13,000 lb · sleeps 628MAV · 11,000 lb · sleeps 629GS · 13,000 lb · sleeps 630G · 13,000 lb · sleeps 731G · 13,000 lb · sleeps 6320G · 16,400 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 351MS on the big marketplaces. Each search opens pre-filled with this exact floorplan:

RV Trader ↗Camping World ↗FB Marketplace ↗Google ↗

Inventory varies by site and day. Slim pickings? search the whole Momentum line ↗

Is the 351MS your #1, or just a spec sheet?

These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about. Set your priorities as sliders, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.

See where it ranks for you →

Data compiled from manufacturer spec sheets, retrieved 2026-07.