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2026 Jayco Seismic 399
NewStock #47034
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
8
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 30 of 56 by asking price in this group.
The listing price on this unit has changed 1 time.
See the complete price timeline and the rest of this unit's pricing insights.
TerryTown RV Superstore
Grand Rapids, MI
Compared with 23 dealers in Michigan
Solar power offers RVers newfound freedom when it comes to their camping experiences by allowing users to break away from shore power constraints. Jayco RV now offers varying levels of optional solar packages on travel trailers, fifth wheels and toy haulers. Your next RV can come equipped with solar prep or optional solar packages.
Jayco Seismic 399 stands out with a GVWR of 20,400 lbs and 3 slideouts, delivering a dramatic 45.92 ft of length for a spacious, high-end feel. Inside, you’ll appreciate premium build quality and 8 sleeping capacity, supported by a 106 gal fresh water tank and 87.0 gal gray water and 87.0 gal black water capacities that keep longer trips hassle-free. Hit the open road with confidence and let every weekend feel like an upgrade, as this towable combines robust hitch weight of 3310 lbs with a dry weight of 14,950 lbs and a generous overall footprint. View the Jayco Seismic at TerryTown RV.
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