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New 2025 Jayco Seismic 399

Toy Hauler Fifth Wheel

Stock #103689

Phoenix, AZ

13' 6" Garage with Queen Bed & Convertible Sofas – Dedicated space for toys and guests

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Specifications

Sleeps	9	Slides	3
Length	45 ft 11 in	Ext Width	8 ft 6 in
Ext Height	13 ft 5 in	Int Height	8 ft 3 in
Hitch Weight	3395 lbs	GVWR	19995 lbs
Dry Weight	14560 lbs	Cargo Capacity	5435 lbs
Fresh Water Capacity	106 gals	Grey Water Capacity	87 gals
Black Water Capacity	87 gals	Tire Size	215/75R17.5'H'
Furnace BTU	35000 btu	Fuel Capacity	30 gals
Number Of Bunks	1	Available Beds	Queen
Refrigerator Type	12 Volt	Refrigerator Size	17 cu ft
Cooktop Burners	3	Number of Awnings	3
Garage Size	11 ft	LP Tank Capacity	30 lbs
Water Heater Capacity	16 gal	Water Heater Type	Gas/Electric DSI
AC BTU	30000 btu	TV Info	LR 4K Smart LED HDTV
Awning Info	21' Electric w/LED Lights, 11' Electric, 10' Rear	Axle Count	2
Washer/Dryer Available	Yes	Number of LP Tanks	2
Shower Type	Walk-In Shower	Electrical Service	50 amp
VIN	1UJCGSCV3S18M0248

Description

New 2025 Jayco Seismic 399 – The Ultimate Luxury Toy Hauler

Designed for thrill-seekers and outdoor enthusiasts, the 2025 Jayco Seismic 399 delivers the perfect mix of rugged adventure and high-end comfort. With a spacious 13’ 6” garage, party deck, multiple sleeping options, and premium entertainment features, this toy hauler fifth wheel is ready for the trails, dunes, or wherever adventure takes you.

Key Features & Highlights:

Rear Party Deck – Transforms the ramp door into an outdoor entertainment space
13' 6" Garage with Queen Bed & Convertible Sofas – Dedicated space for toys and guests
Overhead Loft with Storage – Perfect for extra sleeping space or gear storage
Walk-In Shower – Spacious residential-style shower for ultimate comfort
60” x 80” Queen Bed in Master Suite – Spacious and private, with slide-out for extra room
Full Front Walk-In Closet – Plenty of storage with washer/dryer prep
4K Smart LED HDTV – Premium entertainment experience for movie nights

Luxury Living & Kitchen Amenities:

Dual Opposing Slides in Living Area – Expands interior space for ultimate relaxation
L-Shaped Tri-Fold Sofa – Spacious seating that converts for extra sleeping space
Large Dinette & 17 Cu. Ft. 12V Refrigerator – Perfect for family meals and extended trips
Pantry Storage – Keeps dry goods and snacks organized

Built for Durability & Performance:

102” Wide-Body Structural Steel I-Beam Construction – Maximizes space and strength
Rear Ramp Door/Patio with Non-Skid Flooring – Safe and easy access to your garage
Pass-Through Storage with Slam-Latch Baggage Doors – Extra space for gear and essentials
30-Gallon Fuel Tank with Timer – Keeps your ATVs, motorcycles, or UTVs fueled up

All-Season Comfort & Outdoor Features:

Climate Shield Zero-Degree Weather Protection
- 35,000 BTU Furnace – Stay warm in cold climates
- Fully Enclosed & Heated Underbelly – Designed for year-round camping
- PEX Plumbing System – Prevents freezing and damage
Three Seasons Garage Wall/Doors – Helps maintain a comfortable interior temperature
Exterior Marine-Grade Speakers – Keep the party going outdoors

Why Buy from Little Dealer Little Prices?

Best Prices & No Hidden Fees – Transparent pricing with no surprises
Huge Inventory & Financing Options – Get the perfect RV at a price that fits your budget
Expert Service & Support – Factory-trained technicians ensure your RV is road-ready
Adventure-Ready Guarantee – Every RV is inspected and prepped before leaving the lot

For the ultimate combination of adventure, luxury, and comfort, the 2025 Jayco Seismic 399 is the toy hauler built to take you further. Call or visit Little Dealer Little Prices today!

Stock 360 Tours and Stock Images May Be Shown. Colors and Specs May Vary. Call for Details.

Options:

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

Features

Standard Features (2025)

Standard Exterior Equipment

102 in. wide body structural steel I-beam construction
NPS – Powered by Yamaha 6,000 watt generator with built in pure sign inverter, gas/C.A.R.B certified
6-point hydraulic auto-leveling system
Battery disconnect switch
Climate Shield™ zero-degree tested weather protection:
PEX plumbing
- 35,000 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
Detachable shore power cord
Digital TV antenna
Dual 30 lb. propane bottles with auto regulator
Exterior marine-grade speakers
Folding roof ladder
Fully enclosed, LED-lighted universal docking center:
Black tank flush, winterization and sanitation
Quick-connect outside shower
Satellite prep
HELIX Cooling System™ (industry exclusive):
- Directional and closeable A/C vents
- Jayco-exclusive insulated dual duct design
- Two exterior-mounted 15,000 BTU ducted A/Cs (living room and bedroom)
JaySMART™ (Safety Markers And Reverse Travel) LED lighting (patented)
LED exterior lighting package
LP quick-connect
Magnum Truss™ Roof System (strongest tested roof in the industry) with Alpha roof membrane system with limited lifetime warranty
Painted fiberglass front cap with clear coat and built-in specialty LED lighting
Pass-through storage with Slam-latch™ baggage doors
Stronghold VBL™ aluminum framed and vacuum bond laminated gel coated fiberglass exterior walls and slide room end walls
Under-mounted spare tire
Water heater bypass

Interior Equipment

12V charging station
5/8 in. tongue-and-groove joined plywood main floor decking and 3/8 in. tongue-and-groove plywood in the roof
Bathroom skylight
Carbon monoxide and LP detector
Central command center with built-in tank monitoring
Custom interior design - Vintage Farmhouse
Gas-strutted under-bed storage
Handcrafted and glazed doors, drawers and trim
Hardwood safety handrail on steps
Heavy-duty, 75 lb., full-extension, steel ball-bearing drawer guides
Inverter pre-wire
LED fireplace with electric space heater (select models)
LED interior lighting throughout
No in floor heat registers throughout the coach
Porcelain foot flush toilet
Residential "Do it all" sink with pull-out kitchen faucet, glass rinse and vegetable rinse
Residential finished dove tail jointed drawers throughout
Residential quilted bedspread
Residential vinyl flooring (made in the USA)
Solid hardwood cabinet doors
Stain protected fabric on all furniture
SuperSofa with heat, massage and LED lighting (select models)
Vinyl flooring in slideouts (no carpet)
Washer/dryer prep

Customer Value Package (Mandatory)

16 gal. gas/electric DSI water heater
17 cu. ft. 12V refrigerator
2nd electric awning
30" Space saver microwave
4K Smart LED HDTV with fully digital HDMI® output
50-amp service and 3rd A/C prep
Bluetooth® stereo with 4 speakers
Bathroom power vent
Custom machined aluminum rims
Electric awning with RGB LED lights and remote control
Hidden hinges and magnet door catches on cabinet doors
Keyed-Alike™ lock system
MORryde® strut-assisted fold-away entrance steps (main entrance)
Night shades
Residential 21" oven with three burners
Residential king (72 in. x 80 in.) mattress with under bed-storage
Rooftop and ground solar prep

4 Star Handling Package (Mandatory)

5 in. 16 ply 'H' rated Uniroyal tires
Dexter® Axles with ABS and Tow Assist - includes Nev-R-Adjust® brakes and E-Z Lube® hubs
Rota-flex king pin
Wet bolt fasteners, bronze bushings and 4,000 lb. leaf springs

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
LED high-intensity ramp lights
Ram air vents and power roof vent
Ramp patio kit with exterior steps
Rear electric patio awning
Rear ramp door and patio with anti-slip, non-skid flooring
Three seasons removable garage wall/doors
Tuff-ply, rubberized garage floor liner

Options

Frameless dual-pane tinted safety-glass windows
Outside Halo griddle for outside kitchens or JayPort system (includes LP quick-connect) (select models)
Overlander 2 Solar Package: 30-amp solar controller with (2) roof-mounted 200W solar panels and a 1800W inverter
Overlander 4 Solar Package: (4) 200W solar panels, (2) 100-amp/hour lithium heated batteries, 60-amp controller, 3000W inverter, DC/DC power converter, soft start power save main 15K A/C, soft start power save for bedroom 15K A/C, battery monitor, energy management system, roof pre-wire for additional solar panels, generator prep capable and heavy gauge steel battery enclosure
Queen residential foam-top mattress

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.

Favorite RVs

Save your favorite RVs as you browse. Begin with this one!

Super friendly and helpful staff
Everyone was very helpful, going out of their way to make sure we were prepared when we left the lot, even though it was late on a Friday evening. Despite a few glitches along the way, the team did its best to work through them, always taking time to let us know the status. The service guys, in particular,

Dennis from Phoenix, AZ
Ok
Anthony was very helpful, Patti was good with problems. Will was excellent in going thru trailer.

Darwin from Groom Creek, AZ
Jet our salesperson was awesome!
She took time to go over the unit and answered all of our questions and got us the price we wanted to pay.
We would recommend her and this dealership for all of your motor home or travel trailer needs.
5 star sales lady. Thank you Jet.

John from Prescott Valley, AZ

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Please contact us @ 928-350-2400 for availability as our inventory changes rapidly. Little Dealer Little Prices strives for accurate website information but is not responsible for misprints, typos, or errors on our website. Manufacturer or sample photos and specifications may be used in place of actual unit photos and specs. Monthly payments are an estimate only and do not constitute a commitment that financing or a specific interest rate or term is available. Prices exclude taxes, PDI, documentation and delivery fees, destination charges and fees. This offer expires when this information changes or the stock number is sold.

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