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2026 Jayco Seismic 399
NewStock #13366
Listing price
2026 Seismic 399
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
What sells people on the Jayco Seismic 399 is the combination of a serious garage and genuine living space, all wrapped into one 46-foot fifth wheel. The bath and a half is the quiet hero here, giving your crew a second toilet so the main bath stays free, and two entry doors keep foot traffic flowing between the garage and the front bedroom. It sleeps eight and carries a hefty payload, so the gear comes along without a fight. If you're shopping used, it's worth giving the plumbing, hydraulics, and finish work a close look before you buy.
Length
45 ft 11 in
Dry weight
14,950 lbs
GVWR
20,400 lbs
Sleeps
9
Many factors play into a unit's listing price and what you should pay. This guide provides a ballpark estimate, but it does not factor in your exact scenario or how different listings are equipped.
There may be room for price negotiation.
$79,995 – $112,995
This unit is ranked 29 of 56 by asking price in this group.
The listing price on this unit has changed 6 times.
See the complete price timeline and the rest of this unit's pricing insights.
World Wide RV
Mesa, AZ
Sells faster than 76% of Arizona RV dealers
Compared with 20 dealers in Arizona
The 2026 Jayco Seismic 399is a luxury estate engineered for the wild. This wide-body fifth-wheel toy hauler bridges the gap between rugged utility and high-end residential living. It is built for power sports enthusiasts and full-time RVers who refuse to compromise.
Jayco Seismic toy hauler 399 highlights:
13' 6" Garage
Party Deck
Queen Bed with Convertible Sofas
Overhead Loft for Sleeping or Storage
Walk-in Shower
72" x 80" King Bed
4K Smart LED HDTV
6000W Generator
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 roll-top table 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 king bed for added floor space, plus a full front walk-in closet, a dresser, and washer/dryer prep!
One look at the Seismic toy hauler fifth wheels 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-season garage wall/doors, a 30-gallon fuel tank with a timer, and exterior marine-grade speakers to keep the party going. The zero degree tested weather protection includes a 35,000 BTU furnace and a fully enclosed and heated underbelly for better protection against the elements. And we haven't even touched on the interior luxuries you'll find, like solid hardwood cabinet doors, made in the USA, night roller shades, and more!
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