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Keystone Fuzion 373

Fifth wheelbuilt 2024– (in production)Mixed build tierFindable on the used market
WHAT ONE COSTS
$151,700MSRP today

Still in production. A used 2023 would run roughly $89,500.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~18,133 lbestimated as towed, for 2 people

dry weight 15,890 lb + fresh water (173 gal, full) 1,443 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 around20,150 lb (10% margin)
GVWR (the sticker maximum)19,745 lb
Tongue weight, loaded~4,274 lb (24%)
Cargo capacity3,855 lb
WHICH TOW VEHICLES IT FITS: 15 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 373'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 lb2025 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 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 lb2024–25 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 80it doesn't fit

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

THE SPECS
Length39.5 ft
Height (incl. A/C)13.3 ft
Width8.3 ft
GVWR19,745 lb
Dry weight15,890 lb
Dry tongue weight3,745 lb
Cargo capacity3,855 lb
Sleeps8
Axles2
Fresh water173 gal
Grey water104 gal
Black water104 gal
Air conditioning45,000 BTU

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

WHERE PEOPLE SLEEP
  • 1× Front king bed suite(Permanent)—
  • 2× Garage double electric beds(Stow-away)—
  • 2× Garage dual opposing flip-down sofas(Convertible)—
  • 1× Dinette(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Keystone (Mixed tier): Keystone RV

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
202417,000 lb14,510 lb$151,718
202519,745 lb14,300 lb$151,718
2026–19,745 lb15,890 lb$151,718
  • 2024Introduced
  • 2027Fresh water grew 94 to 173 gal, gray/black to 104 gal, GVWR to 19,745 lb, length to 39'6"
FINDING ONE

Findable: a few listed nationwide most weeks. Why: Keystone is a volume manufacturer; still in production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Shortest tandem-axle Fuzion: 11-foot garage, island kitchen with swing-out stools and a half bath in the garage.

OTHER FUZION FLOORPLANS
3120 · 16,670 lb · sleeps 8337 · 16,900 lb · sleeps 83423 · 16,745 lb · sleeps 8343 · 16,900 lb · sleeps 8359 · 16,880 lb · sleeps 8361LT · 15,800 lb · sleeps 8367 · 16,615 lb · sleeps 8369 · 17,000 lb · sleeps 8379 · 17,000 lb · sleeps 8415 · 19,000 lb · sleeps 8418 · 18,362 lb · sleeps 8419 · 21,000 lb · sleeps 8421 · 20,000 lb · sleeps 8422 · 20,000 lb · sleeps 8the whole line →
Find one for sale

Live listings for the 373 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 Fuzion line ↗

Is the 373 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.