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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)

New 2026 JAYCO SEISMIC 399 Toy Hauler Fifth Wheel for sale at Fretz RV of Philadelphia

Jayco Seismic toy hauler 399 highlights:

Party Deck
Queen Bed with Convertible Sofas
Overhead Garage Loft with Storage
Walk-in Shower
60\" x 80\" Queen Bed
4K Smart LED HDTV

Fretz RV of Philadelphia is your premier RV dealership for new and used RVs! We proudly carry 2023, 2024, 2025, and 2026 models from top brands like Winnebago Minnie, Micro, M-Series, Access, Thrive, Voyage, FLX, Flex, plus Jayco Jay Flight, Eagle, Jay Feather, Air, North Point, Pinnacle, Bungalow, Seismic, and SLX.

We re also your go-to dealer for OPUS Campers (OP4, OP2, OP15, OPLite, Air Off Road), TAXA Outdoors (Habitat, Overland, Cricket, Tiger Moth, Mantis), and Ember RV (e-Series, Touring)

Serving Philadelphia, York, Harrisburg, Lancaster, Allentown, New Jersey, Delaware, New York, and Maryland Fretz RV has one of the largest selections of new, used, and Certified Pre-Owned RVs around! We proudly sell brands like Forest River, Salem, Wildwood, NuCamp (TAB, TAG), Cherokee, Coleman, R-Pod, A-Liner, Dutchmen, Keystone, KZ, Grand Design, Passport, Lance, Solitude, Coachmen, Catalina, Cougar, Sunset Trail, Raptor, Vengeance, Gulf Stream, and Airstream all priced below NADA book value.

With over 79 years of experience, we ve built a trusted reputation in the RV industry as a Winnebago Dealer Partner for over 30 years and a Jayco Dealer Partner for over 40 years.

Why Choose Fretz RV?

Huge indoor showroom (12,000+ sq. ft.)
30,000 sq. ft. Indoor Service Facility
RV Parts & Accessories Superstore
Full-Service RVIA Certified Repair Shop
Easy RV Financing
Instant RV Insuran","itemCondition":"Used","priceCurrency":"USD","price":"109995.00"}}]}}