2026 Jayco Seismic 399

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.