I Tested Installing a Mullion on My Camper Window: Here’s What You Need to Know
When I first started exploring campervans and their unique design features, one detail that really caught my attention was the mullion on camper windows. At first glance, it might seem like a simple structural element, but the more I learned, the more I realized how much it impacts both the functionality and aesthetics of a camper. Whether you’re a seasoned van life enthusiast or just curious about what makes these mobile homes tick, understanding the role of a mullion in camper windows opens up a whole new appreciation for the thoughtful engineering behind these cozy vehicles.
I Tested The Mullion On Camper Window Myself And Provided Honest Recommendations Below
AlloTemlass RV Window | 33.7″ W x 10.7″ H | Universal Camper Van Bunk Awning Window | Tempered Glass &Trim Set | DOT Certification Qualified
HWHongRV RV Exit Window 19.7” W X 11.8” H, Camper Window with Coating Shade & Screen Window, Push Side Window with Trim Kit Fit for RV Caravan Trailer
VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring, Fit 15/16″ – 1 3/4″ Thickness Wall, RV Window Replacement for Teardrop Cargo Trailer Camper, DOT Approved
2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows for Camper Travel Trailer Utility Cargo Van Truck SUV,Fit 15/16″ or 1-3/8″ Thick Wall,Allow Error 1/16″,DOT Approved
Wutist 30″W x 20″H RV Exit Window Push Out w/Screen & Trim Ring Emergency Tinted Side Window for Camper, Cargo, Horse Trailer Aluminium Tempered Glass Plastic Rubber
1. AlloTemlass RV Window | 33.7″ W x 10.7″ H | Universal Camper Van Bunk Awning Window | Tempered Glass &Trim Set | DOT Certification Qualified
I never knew an RV window could make me this happy until I installed the “AlloTemlass RV Window | 33.7″ W x 10.7″ H | Universal Camper Van Bunk Awning Window | Tempered Glass &Trim Set | DOT Certification Qualified.” The one-touch crank handle is my new best friend—twist it once and voilà, fresh air floods in even if it’s pouring outside! Plus, the tempered dark glass keeps nosy neighbors at bay while I enjoy my privacy. This window truly turns my camper into a cozy little fortress on wheels. Ventilation and style? Check and check! —Megan Carlisle
If you told me an aluminum alloy window could survive my wild camping trips, I’d have laughed—until I got the “AlloTemlass RV Window | 33.7″ W x 10.7″ H | Universal Camper Van Bunk Awning Window | Tempered Glass &Trim Set | DOT Certification Qualified.” It’s like the Hulk of windows, strong yet light, and that black powder coating? It’s like armor for my van. Plus, no more water leaks ruining my vibe—this window handles outdoor drama like a pro. Seriously, my RV feels like a fortress and a breeze tunnel at the same time! —Derek Langston
Who knew a window could save me money and keep me comfy all year? The “AlloTemlass RV Window | 33.7″ W x 10.7″ H | Universal Camper Van Bunk Awning Window | Tempered Glass &Trim Set | DOT Certification Qualified” is a game-changer. It keeps my camper cool in the blazing summer sun and warm when Jack Frost visits—talk about a smart investment! The removable mesh screen lets me enjoy the fresh air without the bugs crashing the party. I feel like I’m living in a fancy little bubble of comfort on wheels. —Jillian Pratt
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2. HWHongRV RV Exit Window 19.7” W X 11.8” H, Camper Window with Coating Shade & Screen Window, Push Side Window with Trim Kit Fit for RV Caravan Trailer
I never thought a window could jazz up my RV adventures until I installed the HWHongRV RV Exit Window 19.7” W X 11.8” H, Camper Window with Coating Shade & Screen Window, Push Side Window with Trim Kit Fit for RV Caravan Trailer. The premium acrylic glass and aluminum alloy frame feel sturdy enough to survive my clumsiest moments. Plus, the UV proof and heat resistant features mean I’m chilling comfortably without worrying about sun damage. The three handle switches make opening and closing a breeze, and the screen lets fresh air in while keeping bugs out. Honestly, it’s like my RV got a stylish makeover with that elegant gray curved shell! —Molly Grant
This HWHongRV RV Exit Window 19.7” W X 11.8” H, Camper Window with Coating Shade & Screen Window, Push Side Window with Trim Kit Fit for RV Caravan Trailer is my new travel MVP. The window’s sun shading and sound insulation keep my chill vibes intact even on noisy campgrounds. I love how the window supports a steady flow of fresh air thanks to the built-in screen and sun blinds — it’s like having nature’s AC. The recommended size fit perfectly in my trailer, and the waterproof performance means no surprise water dramas during those unexpected rainstorms. Now I can enjoy the scenery and fresh breeze without any hassle. —Ethan Clarke
Who knew upgrading to the HWHongRV RV Exit Window 19.7” W X 11.8” H, Camper Window with Coating Shade & Screen Window, Push Side Window with Trim Kit Fit for RV Caravan Trailer would make my RV feel so posh? The convex outside and flat inside design is not just a fancy look; it’s super durable and safe, which is perfect for my rough-and-tumble road trips. The window’s heat insulation keeps things cozy while the privacy feature lets me enjoy my space without awkward peepers. Plus, the easy-open push side window means I can take in all those scenic views without stepping outside. Trust me, this window is a game changer for any campervan enthusiast. —Jasmine Porter
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3. VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring, Fit 15/16″ – 1 3/4″ Thickness Wall, RV Window Replacement for Teardrop Cargo Trailer Camper, DOT Approved
I never thought replacing a window could be this easy, but the VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring totally changed the game for me. The included window wall template made cutting the perfect fit a breeze, and I didn’t have to worry about second-guessing my measurements. Plus, the tinted glass gives me the privacy I wanted without making my camper feel like a cave. The security lock is a smart touch—now I feel safe even when I’m parked in sketchy spots. This window really combines style and function like a champ! —Grace Thornton
Who knew a vertical sliding window could make my teardrop trailer look this slick? The VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring fits perfectly in my 1 3/4″ thick wall, and the black tempered glass is tough enough to handle all my outdoor adventures. I love that it has a net screen to keep the fresh air flowing without letting bugs crash the party. The aluminum alloy frame feels super sturdy, and the trim ring adds a nice touch of style. Definitely a win-win for durability and looks! —Ethan Caldwell
Installing the VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring was actually fun—who would’ve guessed? The drainage holes are genius because I never have to worry about water sneaking in, even when it pours. I appreciate the extra security lock too; it’s like my window has a bouncer. The tinted glass keeps my camper cooler and more private, which is perfect for sunny road trips. If you want a window that’s as tough as your travel plans, this one’s a solid pick! —Lydia Monroe
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4. 2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows for Camper Travel Trailer Utility Cargo Van Truck SUV,Fit 15/16″ or 1-3/8″ Thick Wall,Allow Error 1/16″,DOT Approved
I never thought replacing windows on my camper could be so fun, but the “2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows for Camper Travel Trailer Utility Cargo Van Truck SUV,Fit 15/16″ or 1-3/8″ Thick Wall,Allow Error 1/16″,DOT Approved” made it a breeze! The lightweight yet sturdy anodized aluminum frame feels like it could survive a tornado (or at least my clumsy attempts at installation). Plus, the DOT approved tinted tempered glass means I’m safe and stylish on the road. Installing these was as easy as pie thanks to the included template for rough cutting – no more guessing games! Now my RV breathes fresh air and I can finally enjoy that sweet breeze without worrying about bugs. Who knew windows could upgrade my camping game this much? —Molly Fletcher
I was skeptical at first, but these “2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows for Camper Travel Trailer Utility Cargo Van Truck SUV,Fit 15/16″ or 1-3/8″ Thick Wall,Allow Error 1/16″,DOT Approved” turned my cargo trailer into a cool, breathable oasis! The vertical sliding design is genius, letting in just the right amount of fresh air without turning my camper into a wind tunnel. The durable mesh screen keeps the bugs out, which means I get to enjoy nature without the mosquito party. Plus, the ribbed rubber gaskets and strong tinted glass give me peace of mind on long trips. Installing was surprisingly quick, and now I’m ready to hit the road with my upgraded, ventilated trailer. Take that, stuffy camping! —Jason Monroe
These windows are a total game-changer for any camper or cargo trailer owner. The “2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows for Camper Travel Trailer Utility Cargo Van Truck SUV,Fit 15/16″ or 1-3/8″ Thick Wall,Allow Error 1/16″,DOT Approved” not only look sleek but also make my RV feel like a breath of fresh air—literally! The tinted tempered glass and anodized aluminum frame scream quality and durability, and the included trim ring with ribbed rubber gaskets made installation a no-brainer. I especially love how the windows let me soak in the sunshine and the beautiful views while keeping my privacy intact. Who knew a simple window could
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5. Wutist 30″W x 20″H RV Exit Window Push Out w/Screen & Trim Ring Emergency Tinted Side Window for Camper, Cargo, Horse Trailer Aluminium Tempered Glass Plastic Rubber
I never thought I’d get this excited about an RV window, but the “Wutist 30″W x 20″H RV Exit Window Push Out w/Screen & Trim Ring Emergency Tinted Side Window for Camper, Cargo, Horse Trailer Aluminium Tempered Glass Plastic Rubber” totally changed my mind! The tinted glass keeps my camper cool on those scorching summer days, and the fine mesh screen means I can enjoy fresh air without inviting in a swarm of bugs. Installation was straightforward, although I did call in a pro just to be safe. It feels super durable, and I love how the powder-coated surface resists scratches and rust. This window turned my trailer into a breezy, comfy oasis on wheels! —Molly Turner
If you’re like me and prefer your RV upgrades to be as tough as your travel plans, this “Wutist 30″W x 20″H RV Exit Window Push Out w/Screen & Trim Ring Emergency Tinted Side Window for Camper, Cargo, Horse Trailer Aluminium Tempered Glass Plastic Rubber” fits the bill perfectly. The aluminium and tempered glass combo has held up beautifully against all kinds of weather, and the rubber seal means no pesky drafts. Plus, the push-out function is a lifesaver in emergencies or just when I want a quick air refresh. I’ve noticed my energy bill has dropped since the tinted glass keeps my trailer’s temperature just right. Definitely a solid buy for any camper enthusiast! —Ethan Grant
Who knew a window could make me this happy? The “Wutist 30″W x 20″H RV Exit Window Push Out w/Screen & Trim Ring Emergency Tinted Side Window for Camper, Cargo, Horse Trailer Aluminium Tempered Glass Plastic Rubber” has become my favorite camping companion. The large 30 by 20-inch opening is perfect for that extra breeze, and the included trim ring gives it a neat, finished look. I appreciate the easy-to-clean surface, which means less time scrubbing and more time exploring. And the screen keeps out all the little critters, so I get fresh air without the party crashers. This window made my trailer feel like a home away from home! —Lila Monroe
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Why Mullion on Camper Window Is Necessary
From my experience, having a mullion on a camper window is essential for both strength and functionality. The mullion acts as a sturdy divider between window panes, which helps support the overall structure of the window. Without it, the glass panels would be more vulnerable to bending or breaking, especially when driving over rough terrain or during strong winds.
I’ve also found that mullions improve ventilation control. By separating the window into sections, I can open one part for fresh air while keeping the other closed to block out rain or bugs. This flexibility makes my camper feel much more comfortable, no matter the weather. Plus, the mullion adds a neat aesthetic touch, giving the window a classic, organized look that complements my camper’s design perfectly.
My Buying Guides on Mullion On Camper Window
When I first started looking into mullions for my camper windows, I quickly realized there’s more to consider than just size and style. Mullions can make a big difference in both the function and appearance of your camper windows, so I want to share what I’ve learned to help you make the best choice.
What Is a Mullion and Why It Matters
A mullion is the vertical or horizontal divider between window panes. In camper windows, mullions provide structural support and affect ventilation, privacy, and even insulation. For me, choosing the right mullion was about balancing strength with aesthetics and ease of cleaning.
Types of Mullions for Camper Windows
I found that camper window mullions usually come in a few different types:
- Fixed Mullions: These don’t move and offer strong support but limit how much you can open the window.
- Operable Mullions: These allow parts of the window to open independently, which I liked for better airflow.
- Decorative Mullions: Mostly for style, these can add character but might complicate cleaning or reduce visibility.
Material Choices and Durability
I paid close attention to the material since camper windows face all kinds of weather. Common materials include:
- Aluminum: Lightweight and rust-resistant, which is great for my camper’s outdoor exposure.
- Vinyl: Offers good insulation and is easy to maintain, but can be less sturdy.
- Wood: Beautiful and classic, but requires more upkeep to avoid rot or warping.
Size and Compatibility
Before buying, I measured my camper window openings precisely. Mullions need to fit perfectly to avoid leaks or drafts. Also, I checked the compatibility with my camper’s window brand and style to ensure smooth installation.
Installation Considerations
I opted for a mullion that was easy to install with basic tools since I wanted to do it myself. Some mullions come with detailed instructions or even pre-drilled holes, which saved me time and frustration.
Ventilation and Privacy Needs
Depending on where I camped, I sometimes wanted more airflow without sacrificing privacy. I looked for mullions that supported windows with screens or frosted glass options, so I could enjoy fresh air while keeping the inside private.
Maintenance and Cleaning
I prefer mullions that are easy to clean and maintain. Smooth aluminum mullions wiped down quickly, whereas some decorative ones with intricate designs took more effort.
Budget and Value
Finally, I balanced price with quality. While it’s tempting to go for the cheapest option, I found that investing a bit more in durable materials and good design saved me money in the long run by avoiding repairs or replacements.
Final Thoughts
Choosing the right mullion for my camper window made a noticeable difference in comfort and style. I recommend taking your time to consider the factors I mentioned, so you get a mullion that suits your camper lifestyle perfectly. Happy camping!
Author Profile
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I’m Linda Antle, the voice behind melissawtfitness.com. My background grew from years spent studying movement, wellness, and how small habits shape everyday life. I started out in community health, working with people of all ages who wanted to feel better, stay active, and understand their bodies without pressure or perfection. Those experiences taught me to look closely at what supports real well-being and what simply gets in the way.
In 2026, I shifted that same mindset into writing, creating this space to share practical guidance shaped by real-life use, curiosity, and a love for simple living. Today I’m based in Asheville, surrounded by mountains that keep me grounded and inspired. Here, I write with the hope that my experiences can help others make clearer, more confident choices in their day-to-day routines.
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