Description
Consumers, please be aware that if you are purchasing a NEW Motorized OR Non-Motorized Recreational Vehicle from any Kunes RV dealership there will be a transportation fee and a dealer prep fee of $2,495. These fees are for the transportation costs associated with picking the unit up from the Manufacturer and the Pre-Delivery Inspection which includes detailing/clean-up that is mandatory for each NEW RV unit. If you are purchasing a USED Motorized OR Non-Motorized Recreational Vehicle from any Kunes RV dealership there will be a transportation fee charged for the mileage between where the unit is and where the purchase takes place. If you would like to purchase such unit without paying a transportation fee, you can take delivery of the unit at the store it is listed as being sold from and avoid the additional transport fee.
️ The Ultimate Toy Box on Wheels: 2026 Jayco Seismic 399
Why choose between bringing your ATVs or bringing your luxury living room when you can just bring both? Meet the 2026 Jayco Seismic 399. Spanning an absolutely massive 45 feet, this Fifth Wheel Toy Hauler isn't just a camper—it’s a rolling mansion with an attached high-octane garage.
The "Party Deck" Garage
The back of this rig is where the magic happens. It’s a fully functional garage equipped with frame-mounted D-Rings to lock down your side-by-sides, motorcycles, or golf carts. But once the toys are unloaded, it transforms into an epic hangout space. Drop the Anti-Slip Patio Deck Ramp Door to create an elevated back porch (complete with its own Rear Patio Electric Awning). Need extra sleeping space? The HappiJac Electric Lift Beds lower down in seconds. It even features a built-in 30-Gallon Fuel Tank to keep your toys gassed up!
️ The "First-Class" VIP Lounge
Step out of the garage and into a living space that feels more like a high-end condo. Kick back on the massive SuperSofa (which features heat and massage!), switch on the LED Fireplace Spaceheater, and watch the game on the 4K Smart LED HDTV. With three massive slideouts, you have plenty of room to stretch your legs.
Gourmet on the Go
You didn't buy a 45-foot luxury rig to eat burnt hot dogs. This culinary command center is outfitted with a huge 17-cubic-foot 12V Refrigerator, a 3-burner cooktop, and a spacious oven. Serve it all up inside or take the party outside under your TWO Power Patio Awnings with RGB LED lighting and marine-grade outdoor speakers!
The Endless Spa & Slumber Retreat
Standard camper showers are a race against the clock, but not here. Armed with an On-Demand Tankless Hot Water system and massive holding tanks, you can actually enjoy washing the campfire smell off. When it's time to recharge, retreat to the master suite and crash on the Olympic King Bed.
⚡ Unstoppable Off-Grid Power & Climate Control
Want to camp way out in the desert? You've got the juice. Armed with the Overlander II Solar Package (two 200W panels and a 30-Amp controller) and a built-in NPS Yamaha 6.0 Gas Generator, you are completely self-sufficient. Plus, the Climate Shield and THREE 13.5k A/C units mean you control the weather inside, no matter how hot it gets outside.
The "Need to Know" Math
The Dimensions: 45 feet of unapologetic luxury and garage space with 3 massive slideouts.
The Weight: 14,950 lbs dry (20,400 lbs GVWR)—you'll definitely want the heavy-duty truck for this rolling palace!
The Tanks: 106 Gal Fresh | 87 Gal Grey | 87 Gal Black.
The Capacity: Comfortably sleeps 8 happy campers.
The Setup: Push a button and let the 6-Point Hydraulic Auto-Leveling system do the heavy lifting.
Stock #: 20W153 | VIN: 1UJCGSCV9T18M0076 | Condition: New
It’s rugged on the outside, absolute luxury on the inside, and completely ready to haul your favorite toys to the edge of the map. Hitch up and let the good times roll!
Mileage: 0Specifications
Stock Number20W153
VIN1UJCGSCV9T18M0076
Year2026
CategoryFifth Wheel Toy Haulers
ManufacturerJAYCO
ModelSEISMIC 399
LocationSlinger, Wisconsin 53086
ConditionNew
Fresh Water Tank Capacity106 gal
Gray Water Tank Capacity87 gal
Black Water Tank Capacity87 gal
Sleeps8
Number of Slide Outs3
Gross Vehicle Weight20,400 lb
Exterior Length45 ft
Exterior ColorWHITE AND BLACK
Interior ColorMODERN CAPPUCCINO
Shipping Weight14,950 lb
Stock Number20W153|
VIN1UJCGSCV9T18M0076|
Year2026|
CategoryFifth Wheel Toy Haulers|
ManufacturerJAYCO|
ModelSEISMIC 399|
LocationSlinger, Wisconsin 53086|
ConditionNew|
Fresh Water Tank Capacity106 gal|
Gray Water Tank Capacity87 gal|
Black Water Tank Capacity87 gal|
Sleeps8|
Number of Slide Outs3|
Gross Vehicle Weight20,400 lb|
Exterior Length45 ft|
Exterior ColorWHITE AND BLACK|
Interior ColorMODERN CAPPUCCINO|
Shipping Weight14,950 lb|
