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New 2026 Jayco Seismic 399

Toy Hauler Fifth Wheel

Stock #JS3990149

McDonough, GA

"Get ready to experience next-level luxury and power — the all-new 2026 Jayco Seismic 399 is on its way, and with Jayco’s legendary build quality and cutting-edge features, this toy hauler is redefining adventure before it even hits our lot.

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Sale Price: $108,995
MSRP: $141,197
Save: $32,202

Payments From: $869 /mo.

46ft long
14,950 lbs
Sleeps 9

3 slides
Bath and a Half

Two Entry/Exit Doors

See All Specs

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
Exterior Color	Titanium, Metallic Red, Charcoal, Metallic Copper, Metallic Blue Full Body Paint Choices	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
Generator	Yamaha 6000 Watt	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	1UJCGSCVXT18M0149

Description

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

Get ready for outdoor adventures in this spacious toy hauler. Your guests will have the 13' 6" garage with queen bed with convertible sofa and a loft for added sleeping space, plus there is overhead storage for your things and a side man door to come and go easily. The main living area includes dual opposing slides with an L-shaped tri-fold sofa along the roadside and your dinette and refrigerator plus pantry in the curbside slide. Head up the steps to your front private bedroom with the dual entry bath accessible from the hall and inside the master bedroom. Here you will all enjoy a walk-in shower, toilet, and vanity with a sink, plus overhead storage. The bedroom features a third slide out housing a queen bed for added floor space, plus a full front walk-in closet, a dresser, and washer/dryer prep!

One look at the Seismic toy haulers by Jayco, and you'll never go back! Each model features a custom automotive-grade vinyl exterior graphics package, a painted fiberglass front cap with built-in LED lighting, and 102" wide-body structural steel I-beam construction. You'll find the pass-through storage with Slam-Latch baggage doors will make unpacking easier than ever, and the rear ramp door/patio with anti-slip, non-skid flooring will allow you to unload your toys with no trouble at all. These toy haulers feature a three seasons garage wall/doors, a 30 gallon fuel tank with a timer, and exterior marine-grade speakers to keep the party going. The Climate Shield zero degree tested weather protection includes a 35,000 BTU furnace, PEX plumbing, and a fully enclosed and heated underbelly so you can enjoy your adventures year around. And we haven't even touched on the interior luxuries you'll find, like solid hardwood cabinet doors, residential vinyl flooring made in the USA, night shades, and more!

With over 45 years as a family run business we carry great new products from brands like Jayco, Forest River, Venture RV and DRV, and Crossroads and Thor Motor Coach. Southern RV also features certified pre-owned RV's from companies like Keystone, Brinkley, Heartland, Airstream and Alliance,Tiffin and Winnebago. Come into our Cumming or Mcdonough locations and take advantage of the exceptional customer experience and marvelous pricing that has positioned Southern RV as one of the most awarded RV Dealers in the America with two RV Business Top 50 Dealer awards, three Inc. 5000 awards, as well as a Top Ten Venture RV Dealer for four years in a row.

*Advertised sale price may be inclusive of a Finance Concession, please consult a Southern RV sales associate for details.

Features

Standard Features

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!

Thanks to Jill and Daniel for yalls help thru our purchase
We searched all over Georgia, Florida and Alabama before taking a trip to McDonough to purchase our first travel trailer. Jill did an excellent job listening to our needs and providing alternative options for us to compare to the model we thought we wanted. After looking at several different models

Chadd
Mike Paris helped us get the perfect camper
Mike Paris was our salesmans and helped us get the perfect camper for our family! He answered our questions and helped us get pricing worked out! Great experience at southern RV! Highly recommend

Anonymous
Mark Harper was very knowledgeable and I trust what he said.
I've not purchased yet, but when I do, I will call on Mark Harper. He was extremely patient with me when he knew I wasn't ready to purchase just yet. He's very knowledgeable and I trust what he said. He also didn't try to over sell me.

Mark

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Displayed prices include all available discounts and rebates. All customers may not qualify: please ask an associate for details.

Southern RV is not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales tax, registration tags, and delivery fees. Manufacturer pictures, specifications, and features may be used in place of actual units on our lot. Please contact us @770-477-0552 for availability as our inventory changes rapidly. All calculated payments are an estimate only and do not constitute a commitment that financing or a specific interest rate or term is available.

Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. Where an image has a stock image indicator, please confirm specific unit details with your dealer representative.

New 2026 Jayco Seismic 399

399 Floorplan

Specifications

Description

Features