New 2026 Jayco Seismic 399

Standard Features (2026)

PLEASE NOTE: Features and options separated by type below

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FIFTH WHEELS

Exterior Equipment

• 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 includes:
  • 35K BTU output furnace
  • Double-layer fiberglass batt insulation in ceiling and floor
  • Double-sided radiant barrier insulation (roof and floor)
  • Fully enclosed and heated underbelly (ducted)
• 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) includes:
  • Three exterior-mounted 13,500 BTU soft-start, high-efficiency, ducted A/Cs (living room and bedroom) 
  • Directional and closeable A/C vents
  • Insulated dual-duct design
• Pass-through storage with Slam-latch™ baggage doors 
• Under-mounted spare tire
• Fully enclosed, LED-lighted universal docking center with:
  • Black tank flush
  • Winterization and sanitation hookups
  • Quick-connect outside shower
  • Satellite prep

Interior Equipment

• 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
• LED fireplace with electric space heater (select models)
• No in-floor heat registers throughout the coach
• Vinyl flooring in slideouts (no carpet)
• Residential vinyl flooring (made in the USA)
• Hardwood safety handrail on hallway steps
• Carbon monoxide and LP detector
• 5/8 in. tongue-and-groove joined plywood main floor decking and 3/8 in. tongue-and-groove plywood roof decking
• Handcrafted and glazed doors, drawers, and trim
• Solid hardwood cabinet doors
• Residential finished dovetail-jointed drawers throughout
• Heavy-duty, 75 lb., full-extension, steel ball-bearing drawer guides
• SuperSofa™ or theater seats with heat, massage, and LED lighting (select models)
• Stain-protected fabric on all furniture
• Residential “Do it all” sink with pull-out kitchen faucet, glass rinse, and vegetable rinse
• Porcelain foot-flush toilet
• Inverter pre-wire

Customer Value Package (Mandatory)

• On-demand tankless hot water heater
• 50-amp service
• Overlander II Solar Package: 30-amp solar controller with (2) roof-mounted 200W solar panels and a 1,800W inverter
• 17 cu. ft. 12V refrigerator
• 30 in. space-saver microwave
• Residential 21 in. oven with three burners
• 4K Smart LED HDTV with fully digital HDMI® output
• Touch-screen Bluetooth® stereo with four speakers
• Electric patio awning with integrated RGB LED lights (multi-color with remote control)
• MORryde® strut-assisted fold-away entrance steps (main entrance)
• Custom black, machined aluminum rims
• Keyed-Alike™ lock system
• Bathroom power vent
• Night roller shades
• Hidden hinges and magnet door catches on cabinet doors

5 Star Handling Package (Mandatory)

• 17.5 in., 16-ply “H” rated Cooper® tires
• Dexter® axles with ABS and Tow Assist – includes Nev-R-Adjust® brakes and E-Z Lube® hubs
• MORryde® CRE-3000™ Suspension System
• Rota-Flex® king pin
• Wet bolt fasteners, bronze bushings, and 4K lb. leaf springs
• 2nd electric patio awning with integrated RGB LED lights (multi-color with remote control)

Ramp and Cargo Equipment

• 30 gal. fuel tank with timer
• Garage D-rings mounted to steel frame
• HappiJac® electric-lift queen beds/convertible sofas with folding armrests and cup holders
• Three-season removable garage wall/doors
• Tuff-ply™ rubberized garage floor liner
• Rear ramp door and patio with anti-slip, non-skid flooring
• Ramp patio kit with exterior steps
• Rear electric patio awning
• LED high-intensity ramp lights
• Ram air vents and power roof vent

Options

• Frameless, dual-pane, tinted safety-glass windows
• Outside HALO™ griddle for outside kitchens or JayPort® system (includes LP quick-connect) (select models)
• Queen residential foam-top mattress (395 & 399)
• Retractable half-bath wall in garage (395 & 399)

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TRAVEL TRAILERS

Exterior Equipment

• 102 in. wide-body structural steel I-beam construction
• Magnum Truss™ XL6™ Roof System (strongest tested roof in the industry)
• Stronghold VBL™ aluminum-framed and vacuum-bonded, laminated gel coated, fiberglass exterior walls and slideroom end walls
• Painted fiberglass front cap with clear coat and built-in specialty LED lighting
• Climate Shield™ zero-degree tested weather protection:
  • 35K BTU output furnace
  • Double layer fiberglass batt insulation in ceiling and floor
  • Double sided radiant barrier insulation (roof and floor)
  • Fully enclosed and heated underbelly (ducted)
• Custom automotive-grade vinyl exterior graphics package
• Lippert Solid Step®
• Backup camera prep
• Power tongue jack
• 50-amp service
• Detachable shore power cord
• Digital TV antenna
• Satellite prep
• Black tank flush, winterization and sanitation
• Quick-connect outside shower
• Water heater bypass
• LP quick-connect
• HELIX Cooling System™ (industry exclusive):
• Jayco exclusive insulated dual duct design
• Directional and closeable A/C vents
• Slam-latch™ baggage doors
• LED exterior lighting package

Interior Equipment

• 5/8 in. tongue-and-groove joined plywood main floor decking and 3/8 in. tongue-and-groove plywood in the roof
• PEX plumbing
• Carbon monoxide and LP detector
• Central command center with built-in tank monitoring
• Inverter pre-wire
• LED fireplace with electric space heater (select models)
• LED interior lighting throughout
• Custom interior design
• Solid hardwood cabinet doors
• Handcrafted and glazed doors, drawers and trim
• Residential finished dovetail-jointed drawers throughout
• Heavy-duty, 75 lb., full-extension, steel ball-bearing drawer guides
• No in-floor heat registers throughout the coach
• Bathroom skylight
• Porcelain foot flush toilet
• Medicine cabinet with custom framed mirror
• High Rise Kitchen Faucet
• King bed
• Residential quilted bedspread
• Stain protected fabric on all furniture
• Vinyl flooring in slide outs (no carpet)
• Residential vinyl flooring (made in the USA)
• Roll down garage screen (*unless 3 season door is selected)

Customer Value Package (Mandatory)

• 60K BTU On-demand tankless hot water heater
• 12V refrigerator
• Space-saver microwave
• 13.5K BTU A/C
• 17 in. oven with 3 burners
• 4K Smart LED HDTV
• Bluetooth® stereo with 4 speakers
• Roller-shades
• Soft close hidden hinges and magnet door catches on cabinet doors
• Drop-down knife rack
• Integrated cup washer at sink
• Bathroom power vent
• Roll-away shower door
• Electric awning
• Roof ladder prep
• JayPort® 2 in. mount (for outside accessories)
• Keyed-Alike™ lock system
• (2) 20 lb. LP gas bottles with auto-regulator, ABS cover, & fill gauge
• 106 gal. fresh water capacity
• Overlander 1 Solar Package: 200W panel and 30-amp solar controller)

Ramp And Cargo Equipment (Mandatory)

• 30 gal. fuel tank with locking, enclosed pump and timer
• 5,000 lbs. Garage D-rings mounted to the steel frame
• HappiJac® electric-lift queen beds with convertible sofas
• LED high-intensity ramp lights
• Ram air vents and power roof vent
• Tuff-ply, rubberized garage floor liner
• Weather resistant rear ramp door and patio with anti-slip, non-skid flooring

5 Star Handling Package (Mandatory)

• Dexter® axles with Nev-R-Adjust® brakes and E-Z Lube® hubs
• Wet bolt fasteners, bronze bushings, and 4,000 lb. leaf springs
• CRE-3000 suspension
• 16 in. aluminum rims
• Under-mounted spare tire

Options

• 6,000W NPS inverter generator with remote start
• Second A/C
• 3-season removable garage wall
• Rear patio awning
• Slideout awning
• Overlander 2 Solar Package: (2) 200W panels, MPPT 30-amp solar controller and 1800W inverter
• Queen bed in place of king

Please see us for a complete list of features and available options!

All standard features and specifications are subject to change. 

All warranty info is typically reserved for new units and is subject to specific terms and conditions. See us for more details. 

Due to the current environment, our features and options are subject to change due to material availability.