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We do our best to keep listing details accurate, but pricing, specifications, and availability come from third-party sources and can change without notice. We can't guarantee accuracy, so please confirm the details with the dealer before making any decisions. See something inaccurate? Contact us.

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    1. Home
    2. Inventory
    3. SR1 Companies
    4. Manchester, ME
    5. 2025 Jayco Seismic 399

    2025 Jayco Seismic 399Pending

    UsedFifth wheel|Stock #S18M0093-P|Located at SR1 Companies in Manchester, ME
    $74,900

    This unit has a sale pending.

    It's still listed because pending deals sometimes fall through. Ask the dealer to be next in line.

    RV Envy

    2025 Jayco Seismic 399

    Used · Fifth wheel

    $74,900

    SR1 Companies – Manchester

    746 Western Ave Rte # 202

    Manchester, ME 04351

    (833) 811-9186

    Stock #S18M0093-P

    2025 Jayco Seismic 399 floor plan

    Specifications

    Length45 ft 11 in
    Dry weight14,950 lbs
    Sleeps9 people
    Slideouts3

    Full specifications

    AC BTU30000 btu
    Available BedsQueen
    Awning Info21' Electric w/LED Lights, 11' Electric, 10' Rear
    Axle Count3
    Black Water Capacity87 gals
    Cargo Capacity5450 lbs
    Cooktop Burners3
    Dry Weight14950 lbs
    Electrical Service50 amp
    Ext Height13 ft 2 in
    Ext Width8 ft 6 in
    Exterior ColorTitanium, Metallic Red, Charcoal, Metallic Copper, Metallic Blue Full Body Paint Choices
    Fresh Water Capacity106 gals
    Fuel Capacity30 gals
    Furnace BTU35000 btu
    GVWR20400 lbs
    Garage Size13 ft 6 in
    GeneratorYamaha 6000 Watt
    Grey Water Capacity87 gals
    Hitch Weight3370 lbs
    Int Height8 ft 3 in
    LP Tank Capacity30 lbs
    Length45 ft 11 in
    Number Of Bunks1
    Number of Awnings3
    Number of LP Tanks2
    Refrigerator Size17 cu ft
    Refrigerator Type12 Volt
    Shower TypeWalk-In Shower
    Sleeps9
    Slides3
    TV InfoLR 4K Smart LED HDTV
    Tire Size17.5"
    Washer/Dryer AvailableYes
    Water Heater Capacity16 gal
    Water Heater TypeGas/Electric DSI

    Options and equipment may differ from those listed. We do our best to ensure accuracy, but please confirm all details with the dealer before purchase.

    Get more info

    2025 Seismic 399

    2025 Seismic 399
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    Dealer information

    SR1 Companies – Manchester

    746 Western Ave Rte # 202
    Manchester, ME 04351
    (833) 811-9186

    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!

    Vehicle Details

    Year: 2025

    Make: Jayco

    Model: Seismic 399

    Condition: Pre-Owned

    Stock Number:

    S18M0093-P

    SR1 RV

    612 Route 106N

    Loudon, NH 03307

    603-202-7000

    M-F: 9am-5pm

    Sat: 8am-3pm

    Sun: Closed

    This unit has undergone a complete pre-delivery inspection (PDI) and functional systems check. Major systems (water, electrical, propane, appliances, etc.) have been tested and verified to operate properly at the time of sale, or any non-functioning systems have been disclosed. Typically eligible for 3 years coverage with an available service contract at $3,790 or $32/mo. Ask our team for details!

    *Payments are based on 8.49% APR for 240/mo with no taxes included and no money down for qualified applicants. SR1 does not believe in dealer fees. We provide the most transparent pricing in the industry. You will not be charged doc, prep, or destination fees. Please click "get financed" above, to submit an application. We will reply ASAP to the application. Price, information, and availability are subject to change at any time, therefore, information and specifications are not guaranteed. Terms may vary depending on applicants' residency.

    *Manufacturer features may or may not apply to certain units and not others within the same brand and / or series. Please confirm what specific options, packages, and capabilities this specific RV has by calling or texting 603-202-7000.

    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!

    Vehicle Details

    Year: 2025

    Make: Jayco

    Model: Seismic 399

    Condition: Pre-Owned

    Stock Number:

    S18M0093-P

    SR1 RV

    612 Route 106N

    Loudon, NH 03307

    603-202-7000

    M-F: 9am-5pm

    Sat: 8am-3pm

    Sun: Closed

    This unit has undergone a complete pre-delivery inspection (PDI) and functional systems check. Major systems (water, electrical, propane, appliances, etc.) have been tested and verified to operate properly at the time of sale, or any non-functioning systems have been disclosed. Typically eligible for 3 years coverage with an available service contract at $3,790 or $32/mo. Ask our team for details!

    *Payments are based on 8.49% APR for 240/mo with no taxes included and no money down for qualified applicants. SR1 does not believe in dealer fees. We provide the most transparent pricing in the industry. You will not be charged doc, prep, or destination fees. Please click "get financed" above, to submit an application. We will reply ASAP to the application. Price, information, and availability are subject to change at any time, therefore, information and specifications are not guaranteed. Terms may vary depending on applicants' residency.

    *Manufacturer features may or may not apply to certain units and not others within the same brand and / or series. Please confirm what specific options, packages, and capabilities this specific RV has by calling or texting 603-202-7000.

    Specifications

    Length

    45 ft 11 in

    Dry weight

    14,950 lbs

    Sleeps

    9 people

    Slideouts

    3

    Specifications

    Length

    45 ft 11 in

    Dry weight

    14,950 lbs

    Sleeps

    9 people

    Slideouts

    3

    Download brochure
    Download brochure

    Unit features & options

    • 102 in. wide body structural steel I-beam construction
    • NPS – Powered by Yamaha 6,000 watt generator with built in pure sign inverter, gas/C.A.R.B certified
    • 6-point hydraulic auto-leveling system
    • Battery disconnect switch
    • Climate Shield zero-degree tested weather protection:
    • PEX plumbing 35,000 BTU output furnace
    • Double layer fiberglass batt insulation in ceiling and floor
    • Double sided radiant barrier insulation (roof and floor)
    • Fully enclosed and heated underbelly (ducted)
    • Custom automotive-grade vinyl exterior graphics package
    • Detachable shore power cord
    • Digital TV antenna
    • Dual 30 lb. propane bottles with auto regulator
    • Exterior marine-grade speakers
    • Folding roof ladder
    • Fully enclosed, LED-lighted universal docking center:
    • Black tank flush, winterization and sanitation
    • Quick-connect outside shower
    • Satellite prep
    • HELIX Cooling System (industry exclusive): Directional and closeable A/C vents
    • Jayco-exclusive insulated dual duct design
    • Two exterior-mounted 15,000 BTU ducted A/Cs (living room and bedroom)
    • JaySMART (Safety Markers And Reverse Travel) LED lighting (patented)
    • LED exterior lighting package

    Unit features & options

    • 102 in. wide body structural steel I-beam construction
    • NPS – Powered by Yamaha 6,000 watt generator with built in pure sign inverter, gas/C.A.R.B certified
    • 6-point hydraulic auto-leveling system
    • Battery disconnect switch
    • Climate Shield zero-degree tested weather protection:
    • PEX plumbing 35,000 BTU output furnace
    • Double layer fiberglass batt insulation in ceiling and floor
    • Double sided radiant barrier insulation (roof and floor)
    • Fully enclosed and heated underbelly (ducted)
    • Custom automotive-grade vinyl exterior graphics package
    • Detachable shore power cord
    • Digital TV antenna
    • Dual 30 lb. propane bottles with auto regulator
    • Exterior marine-grade speakers
    • Folding roof ladder
    • Fully enclosed, LED-lighted universal docking center:
    • Black tank flush, winterization and sanitation
    • Quick-connect outside shower
    • Satellite prep
    • HELIX Cooling System (industry exclusive): Directional and closeable A/C vents
    • Jayco-exclusive insulated dual duct design
    • Two exterior-mounted 15,000 BTU ducted A/Cs (living room and bedroom)
    • JaySMART (Safety Markers And Reverse Travel) LED lighting (patented)
    • LED exterior lighting package

    Full specifications

    As provided in the original listing

    AC BTU30000 btu
    Available BedsQueen
    Awning Info21' Electric w/LED Lights, 11' Electric, 10' Rear
    Axle Count3
    Black Water Capacity87 gals
    Cargo Capacity5450 lbs
    Cooktop Burners3
    Dry Weight14950 lbs
    Electrical Service50 amp
    Ext Height13 ft 2 in
    Ext Width8 ft 6 in
    Exterior ColorTitanium, Metallic Red, Charcoal, Metallic Copper, Metallic Blue Full Body Paint Choices
    Fresh Water Capacity106 gals
    Fuel Capacity30 gals
    Furnace BTU35000 btu
    GVWR20400 lbs
    Garage Size13 ft 6 in
    GeneratorYamaha 6000 Watt
    Grey Water Capacity87 gals
    Hitch Weight3370 lbs
    Int Height8 ft 3 in
    LP Tank Capacity30 lbs
    Length45 ft 11 in
    Number Of Bunks1
    Number of Awnings3
    Number of LP Tanks2
    Refrigerator Size17 cu ft
    Refrigerator Type12 Volt
    Shower TypeWalk-In Shower
    Sleeps9
    Slides3
    TV InfoLR 4K Smart LED HDTV
    Tire Size17.5"
    Washer/Dryer AvailableYes
    Water Heater Capacity16 gal
    Water Heater TypeGas/Electric DSI

    Full specifications

    As provided in the original listing

    AC BTU30000 btu
    Available BedsQueen
    Awning Info21' Electric w/LED Lights, 11' Electric, 10' Rear
    Axle Count3
    Black Water Capacity87 gals
    Cargo Capacity5450 lbs
    Cooktop Burners3
    Dry Weight14950 lbs
    Electrical Service50 amp
    Ext Height13 ft 2 in
    Ext Width8 ft 6 in
    Exterior ColorTitanium, Metallic Red, Charcoal, Metallic Copper, Metallic Blue Full Body Paint Choices
    Fresh Water Capacity106 gals
    Fuel Capacity30 gals
    Furnace BTU35000 btu
    GVWR20400 lbs
    Garage Size13 ft 6 in
    GeneratorYamaha 6000 Watt
    Grey Water Capacity87 gals
    Hitch Weight3370 lbs
    Int Height8 ft 3 in
    LP Tank Capacity30 lbs
    Length45 ft 11 in
    Number Of Bunks1
    Number of Awnings3
    Number of LP Tanks2
    Refrigerator Size17 cu ft
    Refrigerator Type12 Volt
    Shower TypeWalk-In Shower
    Sleeps9
    Slides3
    TV InfoLR 4K Smart LED HDTV
    Tire Size17.5"
    Washer/Dryer AvailableYes
    Water Heater Capacity16 gal
    Water Heater TypeGas/Electric DSI