+17- SALE PRICE: $1,099,995
- List: $1,699,999
- You Save: $600,004
-
45ft long
-
49,200 lbs
-
Sleeps 5
-
3 slides
-
Cummins X15
-
605 HP
4521 Floorplan
Specifications
| Sleeps | 5 | Slides | 3 |
| Length | 44 ft 11 in | Ext Width | 8 ft 6 in |
| Ext Height | 13 ft 4 in | Int Height | 7 ft 2 in |
| Interior Color | Duxbury, Abilene, Miramar, Wickham | Exterior Color | Traditional and Contemporary Options |
| Hitch Weight | 20000 lbs | GVWR | 54000 lbs |
| Dry Weight | 49200 lbs | Cargo Capacity | 4800 lbs |
| Fresh Water Capacity | 105 gals | Grey Water Capacity | 80 gals |
| Black Water Capacity | 60 gals | Furnace BTU | 85000 btu |
| Generator | 12.5 kW Cummins Onan Diesel | Fuel Type | Diesel |
| Engine | Cummins X15 | Chassis | Spartan K3 Tag Axle |
| Horsepower | 605 hp | Fuel Capacity | 165 gals |
| Wheelbase | 292 in | Available Beds | King |
| Torque | 1950 ft-lb | Refrigerator Type | Viking Stainless Steel w/French Door and Internal Ice Maker |
| Refrigerator Size | 19.8 cu ft | Convection Cooking | Yes |
| Cooktop Burners | 2 | Shower Size | 50" x 34" |
| Number of Awnings | 2 | Axle Weight Front | 20000 lbs |
| Axle Weight Rear | 20000 lbs | Axle Weight Tag | 14000 lbs |
| Water Heater Type | Continuous | AC BTU | 45000 btu |
| TV Info | LR 55" 8K QLED on Power Lift, Cab 43" 4K QLED, BR 50" 4K LED, Ext. 43" 4K QLED | Awning Info | Girard Nova Side w/Window Sensor, Remote Control & LED Lights |
| Washer/Dryer Available | Yes | Gross Combined Weight | 74000 lbs |
| Shower Type | Shower w/Seat | Electrical Service | 50 amp |
Description
The 4521 Floorplan — Designed for Space, Flow, and Privacy
The 4521 floorplan is widely regarded as one of the most livable and well-balanced layouts in the King Aire lineup, combining open-concept entertaining with true residential separation.
Key highlights of the 4521 layout include:
-
Opposing living-room slide-outs, creating a wide, open main living area ideal for entertaining or extended stays
-
Mid-ship half bath, providing guest access without compromising the private master suite
-
Residential-style kitchen with expansive counter space and thoughtful appliance placement
-
Dedicated dinette area with overhead cabinetry, balancing form and function
-
Private rear master suite, fully separated from the living area
-
Extended 84" bedroom slide, increasing bedroom floor space and walkability
-
Lounge-style bedroom seating, replacing traditional furniture for a more refined, relaxed environment
-
Large wardrobe and storage zones, consistent with full-time luxury travel expectations
The omission of a standard bedroom dresser and the use of custom structural framing further enhance openness and flow, reinforcing the 4521’s reputation as a true residential coach.
Custom Exterior Presence
The exterior reflects its one-off nature with special-order paint selections, custom awning fabric, and RGB LED ground lighting with controller, giving the coach a refined yet unmistakable presence after dark. Additional Newmar branding on the door-side awning reinforces its flagship identity without excess.
Refined Interior Craftsmanship
Inside, the coach is finished in Sedona Maple hardwood cabinetry, delivering a warm, tailored aesthetic more reminiscent of a private luxury residence than a recreational vehicle. Every material choice and layout decision supports comfort, longevity, and understated elegance.
Technology, Connectivity & Capability
This 2025 King Aire 4521 blends luxury with long-haul capability, making it equally suited for cross-country travel or extended destination living:
-
Starlink internet system
-
Four SunFree solar panels
-
Enhanced A/V wiring retained for future flexibility
-
Advanced security system
-
Rear camera system with additional prep
-
30A / 120V trailer power integration
This is a coach engineered to function as both a luxury residence and a mobile command center.
Proven NASCAR Pedigree
What elevates this King Aire into true collector territory is its provenance. Originally owned by Legacy Motor Club, the coach features a door personally signed by Richard Petty, Jimmie Johnson, and John Hunter Nemechek—three names representing multiple generations of NASCAR excellence.
This isn’t memorabilia added later. It’s authentic history, permanently embedded into the coach itself.
This 2025 Newmar King Aire 4521 is more than rare. It’s intentional, storied, and impossible to replicate.
Features
Standard Features (2025)
Exterior
- Full-Paint Masterpiece Finish™ with Cut & Buff and Beta Fusion Protection on Front Cap
- Convex Exterior Chrome Mirrors with Remote Control, Defrost, Turn Signals and Side View Cameras
- Entrance Door with Automatic Step
- Rear Hitch for Towing Car
- Assist Handle at Entrance Door
- Dual Latched Front Entrance Door with Power Flush Stepwell Cover
- Mud Flaps
- Rear Protective Tow Guard with Stainless Steel Newmar Name Cutout
- Undercoating
- Hydraulic Leveling Jacks
- Stainless Steel Exterior Trim Pieces and Entrance Door Kick Panel
- Holding Tank Levels Displayed in Exterior Water Works Compartment
- Powered Door Lift for Engine Access
- Two Power Pass Through Storage Trays with Access from Either Side with Two Storage Shelves per Tray
- Ajar Warning for Generator Slide, Baggage Doors, Entry Door, Engine Door and Escape Door
- Push Button Baggage Door Release, Keyless Entrance Door with Touch Pad & Door Bell
- Self-Latching Soft Close Baggage Doors
- Power Washer with 50’ Hose Reel Connected to Hot Water Line
- Passive Entry System
Optional
- Flag Pole Bracket
Construction
- Fiberglass Roof and Integrated Gutter Rail
- Gelcoated Fiberglass Exterior Sidewalls, Front and Rear Caps
- Aluminum-Frame Sidewalls & Roof Construction, 16" on Center
- 5/8" Foam Insulation Laminated in Sidewalls & Ceiling
- Polar Pak R19 Batten Insulation on Roof
- Automatic Mechanical Lock Arms on Non Hydraulic Slideout Rooms-Paddle Style
- Egress Door with Ladder System
Chassis
- Air Leveling Control System
- Alcoa Dura-Brite Aluminum Wheels
- Automatic High Beam Headlights
- Automatic Headlights On/Off
- Electronic Chassis Information Center in Dash
- Electronic Stability Control
- Cummins Connected Diagnostic System
- Cruise Control
- Comfort Drive™ Steering with Power Column & Adjustable Control
- Recessed Fuel Fills with Crossover to Fill from Either Side
- Back-Up Alarm
- Anti-Lock Braking System
- Chassis Battery Disconnect
- Push Button Engine Start
- Glass Dash Instrument Panel
- Heated Steering Wheel
- On Guard Collision Mitigation Adaptive Cruise System with Adj. Following Distance Control on Spartan Chassis
- Tire Pressure Displayed on Glass Dash
- Memory Settings for Driver Seat Pedals, Steering Column & Mirrors
- Auxiliary Air Brake Kit for Towed Vehicles
- Mobileye® Lane Tracking
- Mobileye® Displayed on Digital Dash via Xite Radio Interface on Spartan® Chassis
- Mobileye® Speed Limit Sign Recognition and Dash Display
- Power Tilt and Telescope VIP Smart Steering Wheel
- Steering Wheel Nine Function Switch Pod in Center on Spartan® Chassis
- Spartan® K3, Tag Axle, 605Hp
- Blind Spot Detection
- Valid Digital Glare Free Dash
- Tank Dump Side Tilt Mode
- Wiper Automatic Rain Sensor
- Module Cummins Accumen
- Valor Generation 3 TPMS System on Spartan Chassis
Optional
- Spartan Chassis Onyx Package
- Curt Spectrum Integrated Brake Control on Spartan Chassis
Mechanical and Electrical
Windows, Awnings, and Vents
- Frameless Double-Pane Tinted Safety-Glass Windows
- Fantastic® Vent with Rain Sensor with Hardwood Louvered Cover in Kitchen, Bathroom & Enclosed Stool Room
- Girard Entrance Door Awning with LED Lights, Slideout Covers& Power Window Awnings
- Girard Package-Two Nova Side Awnings with Wind Sensor, Remote Control & LED Lights
- One Piece Tinted Windshield
- Driver Side Power Window
Optional
- Kitchen Window
Air Conditioning and Heating
- Three 15k BTU Penguin™ Heat Pump with Remote Control Thermostat
- Oasis 85K BTU Dual Loop Heat with Continuous Hot Water
- Dash Heater and Air Conditioner
- Driver & Passenger Dash Overhead Ventilation System
- Roof Air Conditioning Drainage System
- Electric Radiant Heat Installed Below Main Floor Tile
Electrical
- 12.5 Kw Cummins Onan® Diesel Generator with Auto Changeover on Hydraulic Slideout Tray
- 10 Watt Solar Panel to Charge Chassis Battery
- Two Lithium Ion Power Packs50 Amp Electrical Service with Flexible Cord with Automatic Transfer Switch
- Battery Disconnect Switch for House Battery
- Two 3000 Watt True Sine Inverters
- Emergency Engine Start Switch
- Engine Block Heater
- Exterior Security Lights
- Midship Side Turn Signals
- LED Lights Recessed in Ceiling and Underneath Overhead Cabinets
- LED Lighting in Pull-Out Pantry, Kitchen and Bathroom Base Cabinets
- Accent Lights in Feature Ceiling, Lambrequins, Kitchen, Bed Base, Fascia Trim and Under Dash
- Reading Lights at Head of Bed-Dimmable with Adjustable Aim
- Backlight Vanity Mirror in Floor Plans with Trough Sinks
- Manually Operated Hold-To-Run Slideout Switch
- Automatic Generator Start on Low Battery or Temperature Setting
- Cable TV Connection
- Interior Courtesy Lights
- USB Outlet at Dash for Driver Use
- 110 Volt/USB Outlet at Head of Each Bunk Area*
- KIB Touch Screen Interior Light and Shade Controls
- Power Rewind Wheel with 50’ Cord*
- Secondary Multiple Touch Screen in Bedroom
- Silverleaf® Multiplex Electrical Wiring System
- Solar Prep with Six Gauge Wire from Roof to House Battery Compartment
- Spare Fuses in Chassis and House Fuse Panels
- LED Lights in Exterior Storage Compartments on Automatic Switches
- LED Lights Installed Below Under Door Side Slideouts
- Exterior LED Accent Lights Below Perimeter Of Unit
- Exterior LED Accent Lights Above Rear Tow Guard
- Rear Hitch Docking Light
- LED Docking Lights with Stainless Steel Trim
- Wireless Charging Mat Built into Passenger Console
- High Power USB Charger at Dinette and Bedroom Night Stand
- Wireless Charging Mat into Dash and Nightstands Countertops
- Pop Up Electrical Recepts Integrated into Kitchen Countertop Ledge
- RV Halo Voice Activation Control System
- Dash Radio, Cameras and Monitors to Power-up from both House Batteries and Ignition
Optional
- Four Flexible 100 Watt Solar Panels on Roof
- 30 Amp/120 Volt Cord Connection for Stacker Trailer
- Roof Mounted Spot Light
Plumbing & Bath
- Demand Water System
- Sewage & Grey Holding-Tank Rinse
- Dometic® Concerto Electric Flush or Macerator China Bowl Stool*
- Full Tiled Shower Walls and Floor
- Fold Down Shower Seat
- Assist Handle in Each Shower
- Exterior Convenience Station - Hot and Cold Water, Soap and Towel Dispenser
- Auto Fill for Fresh Water Tank
- Bladder Tank for Water Pump System
- Power Water Hose Reel
- Power Dump Valves for Holding Tanks
- Aqua Miser Shower System
- Manabloc Plumbing System
- UV/Carbon Filter Drinking Water Purifier with Dedicated Kitchen Faucet
- RV Sanicon Turbo System
Interior
Cabinets and Furniture
- Sable Maple Hardwood Cabinets- Suede Finish
- Concealed Hinges on Cabinet Doors
- Super Polished Solid Quartz Countertop in Kitchen with Farmhouse Sink
- Super Polished Quartz Countertop in Bathroom and Bedroom
- Super Polished Quartz Countertop with Trough Sinks in Master Bathroom
- Lifts on Bed Top
- Radius Corner Mattress Air R5
- Passenger Seat Work Station
- Pullout Pantry Shelves
- Pantry Electric Door Travel Lock System
- Pantry with Space for Serving Trays and Bakeware
- Drawers with Dove Tail Sides with Self Closing Full Extension Ball Bearing Guides
- Soft Close Cabinet Door Hinges with Dual Magnetic Latches
- European Style Cabinetry
- Euro Booth Dinette with Two Table Leaves and Two Folding Chairs*
- Power Comfort Lounge Sofa*
- Visionary V2 Trifold Sleeper Sofa with Memory Foam Mattress*
- Leather Sofa and Driver and Passenger Seats with Integrated Seatbelts
- Driver Seat with Vibrator for Haptic Feedback
- Heated and Cooled Front Seats with Power-Lumbar, Recline, Footrest and Queen Sized Passenger Seat
- Massage Feature Added to Driver and Passenger Seats
- Cedar Paneling in Bedroom Wardrobe*
- Extended Rotation Concealed Hinge for Washer and Dryer Cabinet Door
- Adjustable Support Air Bed
- Mesh Cell Phone Holder at Each Bunk Bed*
- Full Height Wardrobes Beside Lav*
- Molded Silverware Divider Tray
Optional
- Carbon Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- Sable Maple Hardwood Cabinets—Diamond Gloss Finish
- Sedona Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- Summit Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- Two-Tone Summit Maple and Carbon Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- Two-Tone Summit Maple and Sable Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- Two-Tone Summit Maple and Sedona Maple Hardwood Cabinets—Diamond Gloss or Suede Finish
- 42" Euro Booth Dinette with Two Folding Chairs
- 44" Extenda Powered Booth Dinette
- 75" U-Dinette with Powered Adjustable Table
- Combination Desk/Dinette with Buffet Table, Two Fixed and Two Folding Chairs
- Convertible Dinette with Two Fixed and Two Folding Chairs that Face to Window
- Two Recliners with Lampstand and Reading Lights
- Passenger Seat Queen-Size with Standard Features
- Overhead Cabinet Above Dinette
- Overhead Cabinet Above Sofa
- Overhead Cabinet in Dinette/Living Room Slideout
- Overhead Cabinet at Head of Bed
- 84" Powered Theater Seating
- One Ottoman*
Appliances
- Stainless Steel Viking Convection Microwave
- Air Horns
- 19.8 Cu. Ft. Viking Stainless Steel Refrigerator with 36” French Door & Internal Ice Maker
- Samsung® Two-Piece Stacked Washer and 220 Volt Dryer
- Dometic® 2.47 Cf Freezer on Pull-Out Tray in Exterior Compartment
- Central Vacuum with Tool Kit
- All Electric Cooktop with Wolf Induction
- Fisher Paykel® Dishwasher with Wood Panel Front
Optional
- Beverage Center Dual Zone
- Wine Cooler Dual Zone
- Wolf Coffee Maker
- Fireplace in Bedroom
Interior Features
- Designer Feature Ceiling and Cathedral Ceiling with Added Height on Rear Bath Floor Plans*
- Tile Floor in Kitchen, Bathroom, Bedroom and Living Area
- Auto Motion Power Shades and Lambrequins
- Auto Motion Power Shades for Windshield, Driver and Passenger Side Windows
- Flush Handles on Swinging Bath Doors
- Maximized Shoe Storage Shelves Recessed into Rear of Wardrobe*
- Interior Assist Handle at Main Entry Door
- Down Alternative Fitted Bedspread with Accent Pillows
- Leather Window Blind System in Bedroom
- Safe Located in Bedroom Wardrobe
- Wastebasket in Kitchen Base Under Sink
Entertainment
Audio and Video
- Samsung 55” 4K QLED TV in Living Area*
- Samsung 50” 4K QLED TV in Bedroom
- Samsung 43” 4K QLED TV in Front Overhead
- Exterior 43” Samsung 4K QLED TV in Sidewall & S.S. Storage Rack in Storage Compartment*
- Bose® 500 Subwoofer
- Bose® 700 Sound Touch Livingroom
- Bose® Bedroom Speaker
- Doorbell and Camera System at Entrance Door Connected to Remote App
- Internet Connectivity for Remote Access to Motorhome
- Remote Internet Camera Access to Support Live Video Streaming
- Extra Monitor on Passenger Side
- Samsung® Tablet with Control of AV Equipment, Lights, Shades, Keyless Entry and Silverleaf® App
- Winegard Rayzar Automatic Digital TV Antenna
- Satellite Dish Prep on Roof
- Radio SiriusXM® Capability with Antenna (Does not include monthly subscription)
- Cat 6 TV Cables
- Harman Infinity Audio Cockpit Sound System
- Infrared Repeater System to Operate Audio and Visual Components
- WiFi System Everest with Aspen Interior Router
- Xite HD 360 Camera System with Predictive Grid Lines and Tri-View Rear
- Camera
- Xite Dash Radio with Apple CarPlay, 10” Duel Monitor with Nav-N-Go Navigation System
- 10 Bc Fire Extinguisher, Smoke Detector, Propane and Carbon Monoxide Detector
- Two-19” Skyworth TV/DVD Monitors-One at Each Bunk*
Optional
- Security System
- Universal Toll Module
- Rear Camera (2) Prep for Use with Stacker Trailer
- Winegard Automatic Open Face Satellite Dish-for DISH HD and Bell HD TV
- Winegard Automatic Open Face SWM Satellite Dish-for DIRECTV Std/HD and& In-Motion DIRECTV Std, DISH Std/HD
- Winegard Automatic Open Face Satellite Dish and Winegard In-Motion for DISH Network
- Winegard Automatic Open Face SWM Satellite Dish-for DIRECTV
- Winegard In-Motion Dome Satellite Dish-for DISH Std/HD, DIRECTV Std. and Bell Canada
See us for a complete list of features and available options.
All standard features and specifications are subject to change.
All warranty info is typically reserved for new units and is subject to specific terms and conditions. See us for more details.
Due to the current environment, our features and options are subject to change due to material availability.
Save your favorite RVs as you browse. Begin with this one!
Loading
*All calculated monthly payments are an estimate for qualified buyers only and do not constitute a commitment that financing or a specific interest rate or term is available. Financing terms may not be available in all Campers Inn locations. Campers Inn RV Sales is not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales tax, registration tags, and delivery fees. Manufacturer pictures, specifications, and features may be used in place of actual inventory in stock on our lot. Please contact us for availability as our inventory changes rapidly.
Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. Where an image has a stock image indicator, please confirm specific unit details with your dealer representative.
Manufacturer and/or stock photographs may be used and may not be representative of the particular unit being viewed. Where an image has a stock image indicator, please confirm specific unit details with your dealer representative.