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2026 Jayco Seismic 399

The 2026 Jayco Seismic Toy Hauler is built for adventure, offering rugged durability and high-end comfort for all-season camping. With Climate Shield™ zero-degree tested weather protection, a 35,000 BTU furnace, and double-layer fiberglass batt insulation, you’ll stay comfortable in any climate. The fully enclosed and heated underbelly ensures peace of mind even in freezing conditions. With a blend of durability, luxury, and cutting-edge technology, the 2026 Jayco Seismic Toy Hauler is ready for your next great adventure.

Features may include:

Exterior

102 in. wide-body structural steel I-beam construction

Stronghold VBL™ aluminum-framed and vacuum-bond laminated gel-coated fiberglass exterior walls and slide room end walls

Magnum Truss™ XL6™ Roof System (strongest tested roof in the industry) with Alpha roof membrane system (limited lifetime warranty)

Painted fiberglass front cap with clear coat and built-in specialty LED lighting

Custom automotive-grade vinyl exterior graphics package

Climate Shield™ zero-degree tested weather protection

NPS Powered by Yamaha® 6,000-watt generator with built-in pure sine inverter (gas/C.A.R.B. certified)

6-point hydraulic auto-leveling system

Battery disconnect switch

Detachable shore power cord

Dual 30 lb. propane bottles with auto regulator

Water heater bypass

LP quick-connect

Exterior marine-grade speakers

Digital TV antenna

Folding roof ladder

LED exterior lighting package

JaySMART™ (Safety Markers And Reverse Travel) LED lighting (patented)

HELIX Cooling System™ (industry exclusive)

Pass-through storage with Slam-latch™ baggage doors

Under-mounted spare tire

Fully enclosed, LED-lighted universal docking center

Interior

Olympic king bed (359 & 413)

Residential quilted bedspread

Gas-strutted under-bed storage

Washer/dryer prep

12V charging station

Bathroom skylight

Central command center with built-in tank monitoring

Custom interior design (Dune Gray)

LED interior lighting throughout

No in-floor heat registers throughout the coach

Vinyl flooring in slideouts (no carpet)

Residential vinyl flooring (made in the USA)