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Jayco Seismic 359

Fifth wheelbuilt 2023– (in production)Mixed build tierCommon on the used market
WHAT ONE COSTS
$119,300MSRP today

Still in production. A used 2023 would run roughly $70,400.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~15,174 lbestimated as towed, for 2 people

dry weight 13,490 lb + fresh water (106 gal, full) 884 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 around16,860 lb (10% margin)
GVWR (the sticker maximum)17,500 lb
Tongue weight, loaded~3,234 lb (21%)
Cargo capacity4,010 lb
WHICH TOW VEHICLES IT FITS: 19 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 359'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 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-1918,100 lbfits, loaded, with 10% margin
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 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel) '11-1616,600 lb2023 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 lbfits, loaded, with 10% margin
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 76it doesn't fit

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

THE SPECS
Length41.7 ft
Height (incl. A/C)13.3 ft
Width8.5 ft
GVWR17,500 lb
Dry weight13,490 lb
Dry tongue weight2,875 lb
Cargo capacity4,010 lb
Sleeps6
Axles2
Fresh water106 gal
Grey water87 gal
Black water87 gal
Solar (standard)400 W
Awning17 ft

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

WHERE PEOPLE SLEEP
  • 1× Front bedroom king(Permanent)—
  • 1× HappiJac electric-lift queen in garage(Stow-away)—
  • 1× Garage convertible sofa(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameSteel
RoofWalk-on
UnderbellyEnclosed

Jayco (Mixed tier): Jayco

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
202317,500 lb12,855 lb$119,280
202517,500 lb13,405 lb$119,280
202617,500 lb13,390 lb$119,280
  • 2023Introduced
  • 2027UVW 13,490 lb, GVWR 17,500 lb; CCC 4,010 lb
FINDING ONE

Common: usually several for sale within a day’s drive. Why: Jayco is a volume manufacturer; still in production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Smallest Seismic with an 11 ft garage — sized for a side-by-side or two dirt bikes rather than a full-size buggy.

OTHER SEISMIC FLOORPLANS
395 · 21,000 lb · sleeps 7399 · 21,000 lb · sleeps 8403 · 16,500 lb · sleeps 7405 · 16,955 lb · sleeps 9413 · 20,800 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 359 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 Seismic line ↗

Is the 359 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.