+6
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46ft long
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14,950 lbs
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Sleeps 9
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3 slides
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Bath and a HalfTwo Entry/Exit Doors
399 Floorplan
Specifications
| Sleeps | 9 | Slides | 3 |
| Length | 45 ft 11 in | Ext Width | 8 ft 6 in |
| Ext Height | 13 ft 2 in | Int Height | 8 ft 3 in |
| Hitch Weight | 3370 lbs | GVWR | 20400 lbs |
| Dry Weight | 14950 lbs | Cargo Capacity | 5450 lbs |
| Fresh Water Capacity | 106 gals | Grey Water Capacity | 87 gals |
| Black Water Capacity | 87 gals | Tire Size | 17.5" |
| 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 | 13 ft 6 in | 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 | 3 |
| Washer/Dryer Available | Yes | Number of LP Tanks | 2 |
| Shower Type | Walk-In Shower | Electrical Service | 50 amp |
| VIN | 1UJCGSCV2S18M0080 |
Description
Used 2025 Jayco Seismic 399 Toy Hauler – Adventure-Ready Luxury with Massive Garage Space
Key Features That Fuel the Fun:
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13' 6" Rear Garage with Party Deck
The garage also includes:-
A queen bed with convertible sofas
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Overhead loft for additional sleeping space
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Ample overhead storage
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Side entry door for private access
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Spacious Main Living Area with Opposing Slides
The living space feels wide open thanks to dual opposing slides:-
L-shaped tri-fold sofa with plenty of seating
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Slide-out refrigerator, pantry, and dinette for added convenience
A 4K Smart LED HDTV completes the space for cozy movie nights or game-day tailgates.
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Residential-Style Kitchen
With a large pantry, solid-surface countertops, and generous cabinet space, prepping meals on the road has never been easier. Store everything from snacks to full meals with ease. -
Private Master Suite with Full-Size Queen Bed
Retreat to the front bedroom featuring:-
60" x 80" queen bed on a slide for extra floor space
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A full front walk-in closet
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Large dresser
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Washer/dryer prep for extended trips
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Dual entry to the bath for convenience and privacy
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Luxury Bathroom with Walk-In Shower
Featuring a spacious walk-in shower, porcelain toilet, and vanity with sink and storage—this is not your typical RV bathroom.
Built for All-Season Exploration:
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Climate Shield™ Zero-Degree Rated Weather Package
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Fully enclosed and heated underbelly
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Residential PEX plumbing
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35,000 BTU furnace
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Radiant barrier insulation for maximum comfort no matter the season
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Onboard Fuel Station & Garage Wall System
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30-gallon fuel tank with timer lets you fill up your toys on the go
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Three-season garage doors/wall system helps separate climate zones
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Non-slip flooring in the garage is easy to clean and ultra-durable
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Quality Construction
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102” wide-body structural steel I-beam frame
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Painted fiberglass front cap with built-in LED lighting
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Slam-latch baggage doors and pass-through storage for all your gear
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Automotive-grade vinyl exterior graphics for lasting durability
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Why Buy from Little Dealer Little Prices?
At Little Dealer Little Prices, we’re more than a dealership—we’re fellow adventurers committed to getting you on the road in style. You’ll enjoy:
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Transparent Pricing with No Gimmicks
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Friendly, Knowledgeable RV Experts
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Flexible Financing Plans
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Full-Service Support for parts, service, and accessories
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Family-Owned Values with decades of experience
This Used 2025 Jayco Seismic 399 is your all-in-one mobile basecamp. Whether you're chasing adrenaline or just relaxing under the stars, this toy hauler gives you the flexibility, space, and comfort to do it all—your way.
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.
Save your favorite Rvs as you browse. Begin with this one!
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Ross from Phoenix, AZLifetime Warranty
The lifetime warranty is unmatched. Only $300 per year for inspection and 84 items covered. Great deal and makes my wife and I feel secure in buying a brand new camper! -
Brad from ELEVEN MILE, AZLDLP. Rocks
Price and Terry in service -
Michael from Snowflake, AZNew Travel Trailer
The great people at Little Dealer were wonderful to walk me through my first travel trailer.
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