2025 Jayco Seismic TRL. 1UJCGSCV0S18M0112 - Fretz RV

Introducing the new 2025 Jayco Seismic 399, a luxurious and spacious toy hauler designed for adventure and comfort. With a massive garage space for your toys, a stylish living area, and a fully equipped kitchen, this RV offers both convenience and versatility. The 399 features a private master suite, modern amenities, and ample storage, making it perfect for long trips or weekend getaways. Built for durability and easy towing, the 2025 Jayco Seismic 399 is your ultimate home-away-from-home for all your outdoor adventures!

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!

Bath and a Half
Front Bedroom
Two Entry/Exit Doors

4-Star Handling PackageCustomer Value PackageOverlander II Solar Package15,000 BTU Drop-in Cargo A/CHalf Bath

Basic Information

Year: 2025
Make: Jayco
Model: Seismic
Trim: 399
Stock Number: 21903
VIN: 1UJCGSCV0S18M0112
Condition: New
Dry Weight: 14560
Type: Fifth Wheel
Sleeping Capacity: 9
Length (Feet): 45
Construction Body Material: Aluminum
Sidewall Construction: Fiberglass
Dry Weight (kg): 6604.4
Dry Weight (lbs): 14560

Bedroom / Bath

Bathroom
Bathroom Flooring Type: Vinyl
Bathroom Location: Center
Bathroom Medicine Cabinet
Bathroom Mirror
Bathroom Vent / Fan System
Full Size Master Bedroom Closet
Master Bedroom
Master Bedroom Door Style: Conventional Door
Master Bedroom Flooring Type: Vinyl
Master Bedroom Location: Front
Master Bedroom Mirror Doors
Number Of Bathrooms: 1
Number Of Bunk Beds: 1
Number Of Queen Size Beds: 1
Shower
Shower Door Type: Plastic / Glass
Toilet
Toilet Type: Porcelain

Cargo / Storage

Pass-Thru Storage
Cargo Area Auxiliary Gas Tank
Cargo Area Auxiliary Gas Tank Capacity (gal): 30
Cargo Area Auxiliary Gas Tank Capacity (lbs): 113.6
Cargo Area Dimensions
Cargo Area Length (in): 162
Cargo Area Length (mm): 4114.8
Cargo Area Rear Door
Cargo Area Rear Door Style: Ramp Door
Cargo Area Storage Cabinets
Cargo Area Tiedown / Tracks
Diamond Plated Cargo Area Finish
Interior Cargo Area Access Door
Soft Cargo Wall

Comfort

Heater
Sofa
Number Of Sofas: 3
Number Of Convertible / Sofa Beds: 2
Air Conditioning Type: Automatic
Sofa Material: Vinyl
Heater (BTUs): 35000
Heater Type: Automatic

Convenience

Power Vent Fan
Sky Light
Roof Vents
Leveling Jack Type: Front Power / Rear Power

Drivetrain

Number Of Axles: 3

Electrical / Generator

Exterior Plugs
Ground Fault Plugs
Battery
Voltage Meter
Water Pump Power Display
Air Conditioning Prewiring
Heat Prewiring
Battery Power Converter

Entertainment

CD Player
CD Number Of Discs: 1
DVD Player
Television
Radio
Speakers
TV Antenna Prewiring
Cable Prewiring
Satellite Prewiring
Number Of Radios: 1
Number Of Televisions: 1
Speaker Location(s): Interior / Exterior

Exterior

Exterior Patio / Deck
Exterior Patio / Deck Location: Rear
Exterior Flood Lights
Exterior Ladder
Exterior Shower
Retractable Roof Antenna

Holding Tanks

Water Capacity (Gallons): Over 100
Fresh Water Holding Tank Gauge
Gray Water Holding Tank Gauge
Black Water Holding Tank Gauge
Holding Tanks
Number Of Fresh Water Holding Tanks: 1
Number Of Gray Water Holding Tanks: 1
Number Of Black Water Holding Tanks: 1
Total Black Water Tank Capacity (gal): 87
Total Black Water Tank Capacity (l): 329.3
Total Fresh Water Tank Capacity (gal): 106
Total Fresh Water Tank Capacity (l): 401.3
Total Gray Water Tank Capacity (gal): 87
Total Gray Water Tank Capacity (l): 329.3

Interior

Interior Wood Finish
Wallpaper
Living Area Location: Center

Kitchen

Oven/Stove Overhead Fan
Microwave Oven
Sink / Faucet
Kitchen / Living Area
Oven / Stove
Refrigerator
Oven Depth (mm): 533.4
Oven Depth (in): 21
Number Of Oven Burners: 3
Oven / Stove Layout: Oven / Stove
Kitchen / Living Area Flooring Type: Vinyl
Kitchen Location: Center
Kitchen Table Configuration: Chairs
Refrigerator Power Mode: Electric
Refrigerator Size: Full-Size

Safety

Smoke Detector
Carbon Monoxide Detector
Propane Alarm
Emergency Exit(s)
Number Of Emergency Exits: 1

Slide-Outs & Awnings

Slide Outs: 3
Awnings: 3
Slideouts
Awning
Power Retractable Slideout
Power Retractable Awning
Awning Length (ft): 42
Awning Length (m): 12.8

Specifications

Freeze Proof Insulation
GVWR (kgs): 9069.7
GVWR (lbs): 20400
Height (in): 161
Height (mm): 4089.4
Hitch Weight (kgs): 1540
Hitch Weight (lbs): 3370
Interior Height (in): 98
Interior Height (mm): 2489.2
Length (ft/ft): 45
Length (ft/in): 11
Length (in): 551
Length (m): 14
Length (mm): 14000
Number of Doors: 2
Payload Capacity (kgs): 2465.3
Payload Capacity (lbs): 5435
Trailer Level Gauge
Width (in): 102
Width (mm): 2590.8

Suspension / Braking / Wheels

Spare Tire Location: Exterior Mounted
Wheels Composition: Aluminum
Tire Brand: Uniroyal
Rear Tire (Full Spec): Uniroyal Tires 215/75 R17.5H
Rear Tire Aspect Ratio: 75
Rear Tire Speed Rating: H
Rear Tire Width: 215
Rear Wheel Diameter: 17.5
Brakes
Wheels
Tires
Spare Tire
Front Brake Type: Not Applicable
Rear Brake Type: Electric Drum

Utility Hookups

Number Of Propane Tanks: 2
Water Heater Pump Power Mode: Electrical / Propane
Water Heater Tank Capacity (g): 16
Water Heater Tank Capacity (l): 60.6
Total Propane Tank Capacity (gal): 14.2
Total Propane Tank Capacity (lbs): 60
Water Heater Tank
Washer / Dryer Prewiring
Propane Tank(s)
Propane Tank Gauge
Water Heater Tank Bypass

We Take Trades! Email Us Your Trade Info for a Free Appraisal!

We are a top dealer for all 2016, 2017, and 2018 Leisure Travel Vans , Renegade Vienna and Villagio, Midwest Vans, Chinook, Pleasure-Way, Jayco, Roadtrek, Winnebago Era & Travato, Itasca, Coachmen Galleria and Cross Fit motorhomes, in the Philadelphia, Delaware, New Jersey and New York Areas. These campers come on the Mercedes diesel Sprinter, Ford gas, Transit, Dodge Ram Promaster, and Chevrolet, Chevy chassis. These luxury motor coaches are in the top of its class. These motor coaches are considered class A, B, C Super C. Floorplans come anywhere between zero to 4 slides. We are a top dealer for all 2016, 2017, 2018 Winnebago, Jayco, Starcraft and Crossroads trailers and fifth 5^th wheels in the Philadelphia, Delaware, New Jersey and New York Areas. These campers come in as Travel Trailers, Fifth 5^th Wheels, Toy Haulers, Pop Ups, Hybrids, Tear Drops, and Folding Campers. They are in the top of their class. RV floorplans come with anywhere between zero and 5 slides. Most can be pulled with a half ton truck, SUV or Minivan. If you are not sure if you can tow certain weights, you can contact us or you can get tow ratings from Trailer Life. We also carry used and Certified Pre-owned RVs like Forest River, Mobile Suites, DRV, Redwood, T@B, Dutchmen, Keystone, KZ, Grand Design, and Airstream, and are always below NADA values.

We also carry used and Certified Pre-owned RVs like Fleetwood Bounder, Allegro Bus, Phaeton, Dutch Star, Dynasty, Mountain Aire, Discovery, View, Rialta, Born Free, Airstream and are always below NADA values. We take all types of trades. When it comes to RVs, we are your full service stop. At Fretz RV we have a 12,000 Sq. Ft showroom, a huge RV Parts and Accessories store. We have full RV Service and Repair with RVIA Certified Technicians. Bank financing is available for RV loans with a wide variety of RV lenders ready to earn your business. It doesn’t matter what state you are from, we have lenders that cover those areas. We have different RV warranty companies available. We can provide you with rapid RV Insurance quotes with minimal information. We have an RV rental program to serve your short term RV needs. We have detailed videos on RV Trader, RVT, Classified Ads, eBay, and Youtube. Like us on Facebook! Serving all areas of our great nation. Check out our great Google and Dealer Rater reviews at Fretz RV. We are located at 3479 Bethlehem Pike, Souderton, PA 18964. Call for Details!

Welcome to Fretz RV, your PA RV Dealer. You can find our Pennsylvania RV Dealership conveniently located in Souderton, Pennsylvania near Philadelphia, PA.

Fretz RV of Philadelphia is the nations premier dealer for all 2023, 2024, 2025 and 2026 Leisure Travel, Wonder, Unity, Pleasure-Way Plateau TS FL, XLTS, Ontour 2.2, 2.0 , AWD, Ascent, Winnebago Spirit, Sunstar, Travato, Navion, Porto, Solis Pocket, 59P 59PX, Revel, Jayco, Greyhawk, Redhawk, Solstice, Alante, Precept Prestige, Granite Ridge, Melbourne, Swift, Terrain, Seneca, Coachmen Galleria, Nova, Beyond, Renegade Vienna, Roadtrek Zion, SRT, Agile, Pivot, Play, Slumber, Chase, and our newest line Storyteller Overland Mode, Stealth Mystic, Hilt, and Beast 4x4 AWD Off-Road motorhomes So, if you are in the York, Harrisburg, Lancaster, Philadelphia, Allentown, New Jersey, Delaware New York, or Maryland regions; stop by and browse our huge RV inventory today. Fretz RV has been a Jayco Dealer Partner for over 40 years, Winnebago Dealer Partner for over 30 Years and the oldest Roadtrek Dealer Partner in North America for over 40 years!

Fretz RV of Philadelphia is the nations premier dealer for all 2023, 2024, 2025 and 2026 Winnebago Minnie, Micro, M-Series, Access, Voyage, Hike, 100, FLX, Flex, Jayco Jay Flight, Eagle, HT, Jay Feather, Micro, White Hawk, Bungalow, North Point, Pinnacle, Talon, Octane, Seismic, SLX, OPUS, OP4, OP2, OP15, OPLite, Air Off Road, and TAXA Outdoors, Habitat, Overland, Cricket, Tiger Moth, Mantis, Ember RV, e-Series, Touring and Skinny Guy Truck Campers. So, if you are in the York, Harrisburg, Lancaster, Allentown, New Jersey, Delaware New York, or Maryland regions; stop by and browse our huge RV inventory today. Fretz RV has been a Jayco Dealer Partner for over 40 years, Winnebago Dealer Partner for over 30 Years.

We also carry used and Certified Pre-owned brands like Forest River, Salem, Wildwood, TAB, TAG, NuCamp, Cherokee, Coleman, R-Pod, A-Liner, Dutchmen, Keystone, KZ, Grand Design, Reflection, Imagine, Passport, Lance, Solitude, Freedom Lite, Express, Flagstaff, Rockwood, Montana, Passport, Little Guy, Coachmen, Catalina, Cougar, Sunset Trail, Raptor, Vengeance, Gulf Stream and Airstream

We also carry used and Certified Pre-owned RVs like Airstream, Wayfarer, Midwest, Chinook, Phoenix Cruiser, Grech, Born Free, Rialto, Vista, VW, Westphalia, Coach House, Monaco, Newmar, Fleetwood, Forest River, Freelander, Sunseeker, Forester, Freedom Elite, VanDoIt, Chateau, Tiffin Allegro Thor Motor Coach, Georgetown, A.C.E. and are always below NADA values. We take all types of trades. When it comes to campers, we are your full-service stop. With over 78 years in business, we have built an excellent reputation in the Recreational Vehicle and Camping industry to our customers as well as our suppliers and manufacturers. With our participation in the Hershey RV Show every year we can display the newest product with great savings to customers! Besides our presence online, at Fretz RV we have a 12,000 Sq. Ft showroom, a huge RV Parts, and Accessories store. We have a full Service and Repair shop with RVIA Certified Technicians. Financing available. We have RV Insurance through Geico Brown and Brown and Progressive that we can provide instant quotes, RV Warranties through Compass and American Guardian Protective XtraRide, and RV Rentals. We have detailed videos on RVTrader, RVT, Classified Ads, eBay, RVUSA and Youtube. Like and follow us on Facebook, TikTok, Instagram, Twitter X and come visit us every year at the Hershey RV Show. Check out our great Google and Dealer Rater reviews at Fretz RV. Fretz RV of Philadelphia is located at 3479 Bethlehem Pike, Souderton, PA 18964 215-723-3121Call for details. #RV #GoCamping #GoRVing #1 #Used #New #PaDealer #Camping

So come in, and visit Fretz RV Today... "Your PA RV Dealer"

"All RV's listed in buy it now listing or auction are subject to prior sale!"

Fretz RV

3479 Bethlehem Pike

Souderton Pennsylvania 18964

View Map

Ask for:eBay Sales Department
Contact: Contact Us
Phone:(215) 723-3121

Hours
Tues-Fri:09:00 AM-06:00 PM EST
Monday:09:00 AM-06:00 PM EST
Saturday:09:00 AM-04:00 PM EST
Sunday:Closed

We make every effort to present information that is accurate. However, it is based on data provided by the vehicle manufacturer and/or other sources and therefore exact configuration, color, specifications & accessories should be used as a guide only and are not guaranteed. We are not liable for any inaccuracies, claims or losses of any nature. Inventory is subject to prior sale and prices are subject to change without notice and cannot be combined with any other offer(s). The price for listed vehicles as equipped does not include other charges such as: License, Title, Registration Fees, State or Local Taxes, Smog Fees, Credit Investigation, Optional Credit Insurance, Physical Damage of Liability Insurance, Delivery Fees, Finance and/or Documentation Fees. Any and all differences must be addressed prior to the sale of this vehicle.

Auction123 (a service and listing/software company) and the Seller has done his/her best to disclose the equipment/condition of this vehicle/purchase. However, Auction123 disclaims any warranty as to the accuracy or to the working condition of the vehicle/equipment listed. The purchaser or prospective purchaser should verify with the Seller the accuracy of all the information listed within this ad.