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The Jayco Seismic 4125 toy hauler fifth wheel offers a unique floor plan with extremely spacious kitchen, a corner booth dinette, 13 foot garage, and large flatscreen TVs in the living area (50"), the bedroom (40"), and outside (40").

Factory Added Options

  • Party Deck with Folding Rails, Awning and Steps
  • Three-season Insulation in Garage
  • King Bed
  • 15K BTU A/C in Garage
  • Convection Microwave


  • Unloaded Vehicle Weight (lbs)*: 15630
  • Dry Hitch Weight (lbs)*: 3685
  • Gross Vehicle Weight Rating (lbs): 20695
  • Cargo Carrying Capacity (lbs)*: 5065
  • Total Exterior Length: 45' 8"
  • Exterior Width: 102"
  • Interior Height: 103"
  • Wheel Base: 341 - 3/4"
  • Fresh Water Capacity (gals): 136
  • Gray Water Capacity (gals): 50
  • Gray Water Capacity (secondary) (gals): 37
  • Black Water Capacity (gals): 50
  • *Weights based on averages

Exterior Features

  • 6-point leveling system
  • 16" aluminum rims
  • Frameless solar reflective windows
  • Enclosed and heated underbelly
  • 2" block-foam insulated garage floor
  • Electric side awnings with LED lights (2)
  • 16" spare tire
  • Painted front cap with LED blue light bars and Jayco logo
  • Painted front cap with Jayco logo and LED lights
  • 3/8-inch roof decking on 5-inch crowned truss rafters (R-30)
  • 5/8-inch tongue-and-groove plywood main floor decking
  • 12-inch I-Class cambered structural-steel I-beams
  • Seamless roof membrane
  • Climate Shield insulation package
  • Magnum Truss roof system
  • Folding rood ladder
  • MORryde pin box
  • 16-inch, nitrogen-filled radial tires
  • 30-inch x 72-inch radius-cornered entrance door with step light
  • Second 12V electric awning with LED lights
  • Whole-house LED lighting
  • Stor-Galore heated and insulated basement storage
  • Exterior TV hookup in basement area
  • Outside shower
  • Aluminum, quad-tread entry steps
  • Backup camera prep in (2) locations
  • Keyed Alike single key for all doors/locks

Interior Features

  • Whole-house LED lighting (interior and exterior)
  • MCD roller day/night shades
  • Ball-bearing drawer guides, 75-pound capacity

Power, HVAC, Water, and Plumbing

  • Double 30-pound propane bottles
  • Water system winterization kit
  • Roof-mounted solar prep
  • Sani-con Turbo waste evacuation system prep
  • Water heater bypass system
  • Auto-ignition, 40,000-BTU furnace with digital thermostat
  • 5,500-watt Onan generator (CARB-certified)
  • 20-gallon/hour water heater
  • Dual 15,000-BTU A/Cs featuring Whisper Quiet duct system in living room and bedroom
  • 50-amp service
  • Dual propane quick-connects
  • Battery disconnect


  • 50" LED TV in living area
  • AM/FM Bluetooth portable speaker in garage
  • Whole-house speaker system: powered subwooder; sound bar; (2) speakers in slideout room cabinet, bedroom, main bath, and garage; and (2) marine-grade exterior speakers

Bedroom Features

  • Jayco-exclusive residential Simmons mattress
  • Gas-strutted, under-bed storage

Bathroom Features

  • Residential style walk-in shower
  • Bath skylights
  • Bathroom power vent
  • Walk-in shower with fold down seat

Kitchen Features

  • 18 cu. ft. refrigerator
  • 30" residential microwave
  • Hidden hinges
  • Genuine stone and polished glass backsplash
  • Stainless, 3-burner range-top with glass top
  • Oversized 21-inch stainless oven
  • Under-mounted, 50/50 stainless-steel sink and sink covers (2)
  • Pop-up USB charging port in kitchen with 110V outlet

Living Room Features

  • High-end residential sofa with heat massage, LED lights, folding backs, cup holders and USB/110V outlets
  • Electric fireplace

Garage Features

  • Beaver tail garage storage
  • Garage D-rings mounted to steel frame
  • 27-gallon (generator) and 40-gallon (fuel station) fuel tanks with timer
  • 32" LED TV in garage
  • Pull-down rear screen
  • Rear electric queen beds with convertible sofa, folding armrests, cup holders and LED lights
  • Hinged, spring-assist, radius-cornered ramp door, 2,500-pound capacity, 93-3/8-inch-wide opening with anti-slip, non-skid flooring
  • LED high-intensity, flush-mounted ramp lights (2)
  • Decorative chair rail and paneling
  • Tuff-ply, rubberized garage floor liner
  • Steel backers in floor for wheel chocks
  • 24-inch x 72-inch garage door with oversized window, pleated shade and step light
  • Cargo bay wired and framed for 15,000-BTU non-ducted A/C
  • Vent ports, tinted power roof vent, and closeable, directional air conditioner ducts
  • Furrion Lit Bluetooth speaker with flashlight and charging dock
Stock # 19-19553N
Location Camperland of Oklahoma
Year 2019
Make Jayco
Model Seismic
Trim 4125
Condition NEW
Status Available


Class Toy Hauler Fifth Wheel
Secondary Class Toy Hauler
Slide(s) 2
Sleeps 7
Interior Color WALNUT
Weights, Dimensions & Capacities
Hitch Weight (lbs) 3685
Dry Weight (lbs) 15630
Gross Weight (lbs) 20695
Length 45' 8"
Options & Features
Construction, Safety & Power

PLEASE NOTE: We strive to keep our inventory up-to-date and as accurate as possible, however, we cannot guarantee the accuracy of our on-line descriptions or photos. Camperland of Oklahoma is not financially responsible for any discrepancies. Please contact your salesperson with any specific questions about features and specs of the unit you are purchasing. All sales prices are priced without allowance for trades and do not include freight, prep, or doc fees.

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