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2007 Newmar Mountain Aire 4121 High Line for sale by Owner - Canyon Lake, TX

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FOR SALE: Outstanding Condition. One Owner Reliable $278,500 $228,000 USD
Class A - Diesel / Canyon Lake, TX

2007 Newmar Mountain Aire 4121 Immaculate with all options. Includes Soft Cell Water Softener and external whole house 1 micron water filter system. Serviced only by Newmar, RV Mobile Lube and Spartan. Included is many add on accessories including a Brake Buddy and Blue Ox towing system Ready for the road. Selling for 228,500 Vin 4VZAT1C9X7C053856. Thank you for viewing our ad. Rick

I have uploaded two additional photos today. During the winter months this RV is under the protection of a Pole Barn. Protected from the Texas Sun and Winter Weather.

I have loaded additional pictures showing the Coastal Cherry Cabinets close up. This Newmar is in fantastic shape inside and out.

If you are considering a Motorhome, and have not been completely satisfied with what you have seen. The RV industry has changed a lot in the last few years. Check the RV Travel Website for that information.

Why not give us a call and consider this unit. Check out the full list of upgrades on our unit.

Thanks for looking at our ad. Please copy this link!AhcYDFpmoAp5hG-ViCROaWwBSxqD additional pictures of this Newmar This is the Microsoft One Drive that you are going to.

Current Location

Canyon Lake Texas. We will be here approximately 6 months. Thanks for reviewing our ad and if you want will be more than happy to show it to you Enjoy your day

I have uploaded two additional photos today. During the winter months this RV is under the protection of a Pole Barn. Protected from the Texas Sun and Winter Weather.

If you have any questions please Contact us via email, if you want to see this top of the line motor home.

Current Updates. This Newmar is one of the HI Line series manufactured 2007-2009

May 11 2021

Installed new Blue Ox Avail Tow Bar - Motorhome Mount - 10,000 lbs This includes all new two bar connectors

January 20 2021

Installed new Samsung RF18 Refrigerator. This replaced the older Samsung. Includes the Ice Maker Installation by RV Company

January 19 2021

Installed New Interstate Batteries. This includes the Two Chassis and Four Coach Batteries. New Interconnect Cables on Coach Batteries. Installed by RV Company

Oct 6 2020.

Full Chassis service. Oil Change., All Filters, Transmission and Air System, and Power Steering Steering. etc. Chassis inspection also done by service company. Full Generator Service including all filters. Completed by Professional RV Service Company.

Check the last two photos we loaded today showing the Newmar undercover area. Descriptions are above. Thanks

June 1 2020

The Clear Coat on top of the Newmar was starting to peel. Entire Roof, including the Radius side, AC Covers, front and back upper shells were prepared and repainted with 3 coats of factory color paint and 3 applications of Clear Coat. Top Grade products were used and work was performed by Professional RV Body service Company. Looks better than new. Great job

March 15 2020. All work performed by local RV company that we have used before. Same Company that replaced all of our side windows in the Newmar.

During our last trip we got a windshield rock chip. Progressive Insurance authorized the work to replace.

We selected a local company that has a great history on installing windshields in Motorhomes. The Windshield itself is American Made in Ohio.

Wiper Arm and 2 Blades replaced.

Really happy with the new windshield and the installation folks

Nov 24 2019

All work completed by professional RV Service Company.

1 Installed new Slideout Topper awnings. Replaced the originals.

2 Installed new Slideout Topper awning Tube for Drivers side LR Slideout. The tube is a improvement over the original. Nice Operation

3 Installed new King OA1000 "Over the Air TV Antenna. Fully Automatic on station searches. Very nice operation

4 Installed new Dometic Fantastic Fan in Bathroom. This is a fully remote control system.

5 Complete roof inspection. All good

6 Update of Smart Wheel Wiper and Horn Functions.

Nov 2 2019

Full Chassis service. Oil Change., All Filters, Full Transmission and Air System, and Power Steering Steering. etc. Chassis inspection also done by service company. Full Generator Service including all filters. Completed by Professional RV Service Company.

May 1 2019

Installed new Coach and Chassis Batteries. Batteries supplied by NAPA. Also installed Coach batteries interconnecting cables.

Newmar has a new fuse assembly design on their Coach battery system, so the new assembly was installed and the original is now being used as a spare.
Also installed a new Magnum RE-50 inverter remote control. I talked with Magnum and was told the new one has updated software.

Just finished a 1500 mile RV trip and the battery system is working great. The Inverter, Batteries etc all working as designed.

April 20 2019

Installed LLumar Professional grade Window Tint to the Drivers viewing Window and the Entrance Door. This film eliminates 99 percent of damaging UV Rays with a 55 percent heat reduction. LLumar is the leader in meeting specializations for Window Tint Products. The LLumar Tint is extremely sharp and will not hinder your vision. Great Light transfer.

November 2 2018

Full Annual Service including Differential, all Engine Filters, Lubrication., Air Dryer. Coolant Test Etc.

Generator Serviced including Oil, Oil Filter,Fuel Filter, Air Cleaner. Use a professional service company for this work.

Oct 15 2018

A new UHD Samsung Full High Definition Series TV, was installed in the RV. See the Photos for the details.

August 24th 2018

Replaced Michelin Front Tires. The Rear Tires are all in great condition.

August 22 2018

Spartan Authorized Service Company completed full alignment and ride height adjustments. Also the Three Ride Height Control Assembly were replaced. This Chassis has 2 Height Controls on the front and one on the back. Full Chassis inspection and all components are good.

April 9 2018

Replaced 15 windows in the RV. This is a thicker window and all have been tinted.

The windows were removed during installation and the Window Mounting areas were cleaned and checked. . No Water, No Rust on Hardware. Mounting area just like new. The photo near the end shows the condition of the mounting area. Great Condx

All new windows seals and all glass areas recaulked. Great Job by the installers.

I have included photos of the new windows. The windshield was not replaced as it is in perfect condition. The last 4 photos show the new windows.

Installation completed by Professional Glass Company that has been in business for 21 years. The owner and his Son do all the work. Great Job.

March 13 2018
All Engine Belts were changed by Diesel Company and their Heavy Diesel Service Mechanic.

The Three Belts were replaced with new belts from Spartan. The Idler Bearings were all checked and found to be operating normally. I kept the old belts and also have a complete set of new belts, in case they are every needed for on road emergencies.

Nov 28 2017

Full Annual Service including Differential,all Engine Filters, Lubrication., Air Dryer. Coolant Test Etc.
Generator Serviced including Oil, Oil Filter,Fuel Filter, Air Cleaner.

August 2017

Coolant Level Sensor Updated with new part from Spartan. Sensor professional installed and complete system check out.

June 2017.

Service completed on Chassis AC. Professional Company completed the work. AC Works perfectly.

March 2017

Latest additions to this top of the line Newmar Motorhome. All the items were added on during the December 2016 to March 2017 time frame.

Annual Aqua Hot Service by a Authorized Aqua Hot Service Company. This was a full service visit. Filter/Nozzle and Gaskets replaced. Motor Assembly was reinserted and properly torque with a torque wrench, to ensure proper operation. Combustion area fully cleaned. All Aqua Hot operations were completed 5 times to verify reliability.

Added a New Aqua Hot Low Emission Motor Assembly to our Newmar on Board spare parts.
This motor assembly is complete, with Coil, Motors, Flame Sensor, Fuel Pumps etc. Also included is 2 steel fuel lines and necessary adapters.

This assembly can easily be installed by anyone with a basic mechanical skills.

Added 4K UHD DVD to both Samsung Full Resolution TV’s.

New Vanity Light installed in one of the Bath Rooms. Light is a Newmar Product that they currently install on their Essex and King Aire Motorhomes.

New Fantastic Fan and Blade assembly installed in Bath Room. Pop Top Screens were also replaced. Both Blade exterior covers were replaced with Fantastic Fans newest UV type gray cover.

Just recently the Motor Home was cleaned from top to bottom. Please check the new photos.

Nov 2 2016
1aaa Annual Maintenance Service. All Filters Lubricates, Transmission Filters and Fluid Change . Inspections. Chassis Lube and inspection. Generator fully serviced with Oil, Oil Filter, Fuel Filter and Air Filter. Etc.

Installed October 2016. New Samsung - 40" Class (40" Diag.) - LED - 2160p - Smart - 4K Ultra HD TV with High Dynamic Range. This the Living Room TV

Professional Installation in Living Room.

Professional style Tilt mount used to secure Television. This mount will hold up to 180 lbs. With the release system, the Television can easily be removed.

Yamaha Professional Sound Bar system installed. This makes a tremendous difference in the sound from this TV. True listening pleasure. Current Photo of Installation uploaded

1A July 27 2016. Installed a new Thetford ARIA II deluxe toilet. Installation by a Authorized Thetford Dometic service company
A1A. June 17 2016. Installed 2 American Made Rocker Recliners by "Best" Furniture company of Ferdinand Indiana. Their web site is

The original Ultra Leather couch was removed in the above project. New Photos of this install included.

A2. Installed March 2016. New Samsung 48 Inch HDTV 4K Television. Professionally Installed in Outside Bay TV Area. This TV is 48 inches and the Bay area door is 53 inches. This TV is easy to see and enjoy many feet away from the Motorhome. PLEASE NOTE THIS TELEVISION WAS REMOVED TO MAKE ROOM FOR THE SAMSUNG ULTRA HD TV SYSTEM. SEE OCTOBER 15 2018 ENTRY. THANKS

Professional Tilt mount installed to hold this Television. Mount is rated at 180 lbs. With locking mechanism the TV is easily removed.

A Professional Yamaha Sound Bar System installed above this Television. Makes a tremendous difference in the quality of the sound. True listening pleasure. Current Photo of Samsung has been uploaded

1 A new Samsung RF18 Residential Refrigerator was installed on October 7 2015. This energy star unit has the Samsung Twin Cooling Unit, ice maker, LED lights etc.

Total capacity is 18 Cubic Feet. Quiet and Spacious. I uploaded 2 photos of the new Samsung so you can see how nice it looks in this Newmar. If you are interested in the installation photos, or any questions about the installation please contact me.

1A A new Dometic Model 975 electric door awning installed on August 4th 2015.

1B This unit has a new Aqua Hot AHE450 DE4 Hydronic heating system. Aqua Hot was installed March 2014.

1C Aqua Hot had a Technical Service Bulletin for the original zone pumps on the Aqua Hot System. All 4 pumps on this Aqua Hot have been updated to the new more powerful, and greater capacity pump system. Pumps were installed Dec 11, 2015 by a Authorized Aqua Hot Service Company

1D Tire Protection USA tire monitoring system (12 Sensors) installed
April 2015. For Additional Information on the Tire Protection System. Copy this link and place in your browser
2 This Newmar also sports 8 Brand New Michelin XZA2 Energy 315/80R22.5 Tires. They were installed October 2012.
3 The roof was recently replaced by Newmar. Roof was under Newmar Warranty. There were cracks in the clear coat along the radius. Did not meet Newmar’s standards.
4 Newmar has replaced the front Diamond Shield. Original had a few scratches
5 All Batteries replaced Feb 2012
6 Front AC replaced in Sept 2011
7 The last Full Service completed November 2015 Mileage is 58.728 miles. All service records are available to a qualified buyer. ]
8 Price also Includes many spare service items such as Smart Wheel Decoder, Cabinet Hardware, Engine Belts, Spare Interior Bulbs, Outside Marker Lights assemblies for front (Yellow) and rear (Red).
9 With our current load this Spartan K2 Chassis still has room for approximately 5000 additional pounds. Weigh Slip is Available. All Tires were measured individually
10 The Cummins ISM will operate efficiently on any of the diesel fuels now on the market. Low Sulphur, B5, B20. NO DEF REQUIRED. Unless I have no choice I always choose non bio diesel fuels.


1 30” GE Speedcook Advantium Microwave Oven
2 Located in Bay 1 is a Norcold Freezer/Refrigerator on pull out tray
3 Spendide Washer Dryer Combination Washer Dryer System
4 XM Satellite Radio with CD Changer. XM not activated
5 External Entertainment Center with High Def TV
6 King Dome In Motion Satellite
7 Entertainment Center Living Room with Surround Sound
8 Navtec Built In Navigation Computer with Color Monitor and Disc
9 Side View Cameras. These are new cameras. Original replaced by Newmar
10 CB Radio with Antenna
11 Coastal Cherry Hardwood Cabinets
12 2 Ultra Leather Sofas
13 Onan 10KW Generator
14 Onan Remote Control System.
15 Large Storage pull out tray with access either side
16 Small Storage Pull Out Tray
17 Power Baggage Door Locks
18 Essex Electronics Security entrance and alarm system. Includes Two remote Keyless entry controls
19 Polished Porcelain Floor Tile Living Room and Bath Areas.
20 Girard Power Awning with Win Sensor and Remote Control
21 The very latest Aqua Hot Hot Heating System
22 Combination Desk/Dinette System. Table has 2 extensions. Desk has a computer and file cabinet.
23 Energy Management System Programmable Start and Stop of Generator.
24 Magnum Inverter Magnum Energy Control System
25 Tire Protection USA tire monitoring system (12 Sensors) installed
April 2015. For Addtional Information on the Tire Protection System. Copy this link and place in your browser


Price history

Original Price$278,500
Listed Price$268,500(-10,000)
ReducedApr 2/2020$228,000(-40,500)
Total Price Change:-$50,500

Excluding price changes of less than $100.

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