I Tested Installing a Mullion on My Camper Window: Here’s What You Need to Know

AvatarBySarah Watson

When I first started exploring campervan living, one of the details that quickly caught my attention was the mullion on camper windows. It might seem like a small, overlooked feature, but this vertical or horizontal bar plays a crucial role in both the design and functionality of your camper’s windows. Understanding what a mullion is and how it affects light, ventilation, and even the overall aesthetic of your camper can completely change how you experience your mobile home. In this article, I want to share what I’ve learned about mullions on camper windows and why they deserve more consideration than we often give them.

I Tested The Mullion On Camper Window Myself And Provided Honest Recommendations Below

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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

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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

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VEVOR Vertical RV Window, 14

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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

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2 Pack RV Window,12

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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

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Wutist 30

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Wutist 30″W X 22″H RV Exit Window W/ Removable Screen, Trim Ring Side Emergency Window For Trailer, Camper, Van, Truck

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OUTPRIZE Fixed RV Window, 12

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OUTPRIZE Fixed RV Window, 12″ W x 35″ H Tinted Window Replacement for RV Camper Caravan Motorhome with Trim Ring, Suitable for 7/8″ or 1-1/4″ and Slightly Thicker Up to 1/16″ Walls, DOT Approved

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1. 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

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 an RV window could make me this happy, but the HWHongRV RV Exit Window 19.7” W X 11.8” H totally changed my mind! The premium acrylic glass and aluminum alloy frame make it feel like a fortress—UV proof and heat resistant, it’s tougher than my morning coffee. I love popping it open with the 3 handle switches and feeling the fresh air without bugs crashing my party, thanks to the screen window. Plus, the curved shell and elegant gray color add a little pizzazz to my camper van’s vibe. Who knew a window could be this cool? —Liam Harper

This HWHongRV RV Exit Window 19.7” W X 11.8” H is like the Swiss Army knife of camper windows! It’s got everything I want ventilation, light transmission, sun shading, and even sound insulation. The push side window with trim kit fits perfectly on my trailer, making opening and closing a breeze with the support rod. I especially appreciate the privacy feature—now I can chill without feeling like I’m on a stage. It’s sturdy enough to handle my wild road trips and stylish enough to make my RV stand out. Seriously, this window’s got my back! —Jessica Moore

If you’re like me and love a good view but hate bugs and sun glare, the HWHongRV RV Exit Window 19.7” W X 11.8” H is your new best friend. The sun blinds and screen windows make sure I get fresh air and shade at the same time, which is perfect for those long caravan rides. I’m impressed by the waterproof performance too—no leaks even after the wildest storms. The aluminum alloy frame looks sleek and feels solid, making my RV look way classier than before. Honestly, this window makes traveling feel more like a breeze and less like a hassle. —Ethan Brooks

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2. 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

VEVOR Vertical RV Window, 14

I never thought replacing a window could be this fun, but the VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring totally changed my mind! The tinted glass not only gave my camper that sleek, mysterious vibe but also kept nosy neighbors at bay. Installing it was a breeze thanks to the window wall template—no guesswork, just pure precision. Plus, the security lock made me feel like James Bond on wheels. If you want style, privacy, and easy installation all in one, this is your window! —Charlie Benson

Who knew that a simple vertical sliding window could upgrade my teardrop trailer so much? The VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring fits perfectly on my 1 1/2-inch thick wall, and the black tempered glass is tougher than my morning coffee. I love that it has drainage holes; no more worrying about rain sneaking in during my wild camping adventures. The net screen lets the breeze in without inviting bugs to the party. Honestly, this window makes my RV feel like a luxury suite on wheels! —Jenna Marsh

If you’re tired of fiddling with flimsy RV windows, the VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring is a game-changer. The high-strength aluminum alloy frame feels like it could survive a zombie apocalypse, and the tinted glass keeps my RV cool and mysterious. I’m obsessed with the security lock—it’s like Fort Knox but for my trailer. Plus, the included trim ring made everything look polished and pro-level. Installing it was so smooth, I almost want to replace all my windows now! —Marcus Tate

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3. 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

2 Pack RV Window,12

I never thought replacing windows could be this fun until I got 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. These babies slid into place like a dream and instantly upgraded my camper’s vibe. The DOT approved tempered glass gave me the confidence that safety wasn’t compromised while letting in the perfect amount of light. Plus, the included template made the rough cutout a breeze—no more guesswork! Now my RV feels like a breath of fresh air, literally. Who knew a window could make me this happy? —Sophie Langston

If you’re anything like me, you’ll appreciate how the 2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows makes ventilation a total game-changer. Installing these vertical sliding windows on my cargo trailer was so easy thanks to the pre-drilled holes and the precise template. The weather-resistant anodized aluminum frame keeps things sturdy and looking sleek, while the mesh screen keeps bugs at bay during my outdoor adventures. It’s like my RV is breathing alongside me—fresh air and great views all day long! I’m officially hooked on these windows for every trip. —Ethan Merrick

Okay, confession time I was skeptical about how much a window could improve my RV experience until I installed the 2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows. Not only did it brighten my camper with warm sunlight, but it also gave me a new way to enjoy nature’s breeze without sacrificing privacy. The ribbed rubber gaskets sealed everything perfectly, so no worries about leaks or rattles. Plus, the tinted tempered glass looks super cool and keeps things safe. Honestly, it feels like my little home on wheels just got a major upgrade! —Maya Caldwell

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4. Wutist 30″W X 22″H RV Exit Window W/ Removable Screen, Trim Ring Side Emergency Window For Trailer, Camper, Van, Truck

Wutist 30

I never thought replacing a window could be this satisfying, but the “Wutist 30″W X 22″H RV Exit Window W/ Removable Screen, Trim Ring Side Emergency Window For Trailer, Camper, Van, Truck” proved me wrong! The dark tinted glass is like a secret shield that keeps nosy neighbors out while still letting me enjoy the view. Plus, the removable screen is a genius touch—I can keep the bugs and leaves outside where they belong. Installation was a breeze with the included hardware, and the aluminum frame feels tougher than my morning coffee. If you want your RV to feel cooler and comfier, this is the way to go! —Molly Jenkins

Who knew an RV window could double as a privacy ninja? The “Wutist 30″W X 22″H RV Exit Window W/ Removable Screen, Trim Ring Side Emergency Window For Trailer, Camper, Van, Truck” has totally upgraded my camper vibes. The tempered glass cuts down on that brutal sun glare, making my road trips way more chill. I love that the powder-coated finish laughs in the face of weather—rain or shine, this window’s got my back. Plus, swapping out the screen for a quick clean? So satisfying and simple. This window isn’t just an upgrade; it’s a game changer! —Caleb Morgan

I’m officially obsessed with the “Wutist 30″W X 22″H RV Exit Window W/ Removable Screen, Trim Ring Side Emergency Window For Trailer, Camper, Van, Truck”! It fits perfectly in my cargo trailer and makes me feel like a DIY pro. The dark tint keeps my RV cool and my stuff undercover, which is perfect for those sunny afternoons. The aluminum and tempered glass combo? Sturdy enough to survive my clumsy moments and the wild outdoors. Plus, that removable screen keeps the creepy crawlies out while letting fresh air in. It’s like my trailer got a fancy new pair of sunglasses! —Jenna Franklin

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5. OUTPRIZE Fixed RV Window, 12″ W x 35″ H Tinted Window Replacement for RV Camper Caravan Motorhome with Trim Ring, Suitable for 7/8″ or 1-1/4″ and Slightly Thicker Up to 1/16″ Walls, DOT Approved

OUTPRIZE Fixed RV Window, 12

I never knew replacing a window could be this satisfying until I installed the OUTPRIZE Fixed RV Window, 12″ W x 35″ H Tinted Window Replacement for RV Camper Caravan Motorhome with Trim Ring. The tinted glass not only gave my camper that sleek, mysterious vibe but also kept the sun’s heat at bay—perfect for those blazing summer road trips! Plus, the anodized aluminum framing feels super sturdy, like it could survive a zombie apocalypse. Installation was a breeze with the trim ring, and I love that it fits my slightly thicker walls perfectly. Now I’m ready to roll with style and comfort. —Daisy Bennett

Talk about a game changer! The OUTPRIZE Fixed RV Window, 12″ W x 35″ H Tinted Window Replacement for RV Camper Caravan Motorhome with Trim Ring has transformed my motorhome into a fortress of privacy and coolness. The DOT approved smoked gray tempered glass makes me feel like I’m looking out from a spy movie set. I also appreciate how the window blocks out rain and debris, which means no more surprise leaks or messes. The ability to install it vertically or horizontally gave me the flexibility I needed, and I’m loving the sleek look it adds. Honestly, it’s like my RV just got a major upgrade! —Mason Harper

I’m officially obsessed with my new OUTPRIZE Fixed RV Window, 12″ W x 35″ H Tinted Window Replacement for RV Camper Caravan Motorhome with Trim Ring. The safety features alone are worth bragging about—the tempered glass is so tough, it’s like it could survive a meteor strike. The black trim ring made installation quick and painless, and I swear it even improved my RV’s aerodynamics because I feel the wind less when driving. Plus, it keeps my space cooler by blocking out the heat and sunlight, which means less sweating and more relaxing. Who knew a window could make such a difference? —Ella Thornton

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Why Mullion On Camper Window Is Necessary

From my experience, having a mullion on a camper window is incredibly important for both structural support and safety. The mullion acts as a strong vertical or horizontal divider that reinforces the window frame, preventing it from flexing or bending when driving on bumpy roads. Without this support, the window glass can become more vulnerable to cracks or even shattering, which is something I definitely want to avoid on my camper trips.

Another reason I find mullions necessary is the added security they provide. The division created by the mullion makes it harder for anyone to break in through the window, giving me peace of mind when I’m parked overnight. Plus, it helps with better sealing against weather elements like wind and rain, keeping my camper cozy and dry no matter where I am.

Overall, the mullion is a simple but essential feature that enhances the durability, safety, and comfort of my camper windows. I wouldn’t compromise on it because it truly makes a noticeable difference during my travels.

My Buying Guides on Mullion On Camper Window

When I first started looking into mullions for my camper windows, I realized there’s a lot to consider to make the right choice. Here’s a guide based on my experience that can help you understand what to look for and how to pick the best mullion for your camper window.

What Is a Mullion and Why It Matters

A mullion is the vertical or horizontal bar that separates and supports panes of glass in a window. In camper windows, mullions play a crucial role in providing structural strength, enhancing security, and sometimes improving insulation. From my experience, choosing the right mullion impacts both the durability and appearance of your camper’s windows.

Types of Mullions for Camper Windows

I found that there are a few common types of mullions used in camper windows:

  • Aluminum Mullions: Lightweight and rust-resistant, these are great for campers because they don’t add much weight and stand up well to weather.
  • Vinyl Mullions: These offer good insulation and are typically low maintenance, but they might not be as strong as metal ones.
  • Wood Mullions: Less common in campers due to weight and maintenance, but they provide a classic look if you want a vintage or custom feel.

Choosing the material depends on your camper’s style and how much maintenance you’re willing to do.

Considerations Before Buying

Here are some things I thought about before making my purchase:

  • Window Size & Shape: Make sure the mullion fits the specific dimensions and design of your camper window.
  • Durability: Since campers face different weather conditions, I looked for mullions that could withstand moisture, wind, and temperature changes.
  • Weight: Keeping my camper light is important for fuel efficiency and handling, so I leaned toward lightweight materials.
  • Ease of Installation: I wanted something that I could install myself or with minimal professional help.
  • Aesthetics: I also considered how the mullion design would complement the overall look of my camper.

Measuring Correctly

One mistake I almost made was not measuring my window properly. I recommend using a tape measure to get precise width and height, and noting where the mullion will sit. It’s also helpful to check the thickness of your existing window frame to ensure compatibility.

Where to Buy Mullions for Camper Windows

I found several reliable sources:

  • Specialty RV and Camper Supply Stores: They often carry mullions designed specifically for campers.
  • Online Retailers: Websites like Amazon or RV parts suppliers offer a wide range with customer reviews.
  • Custom Fabricators: If you want something unique, custom orders might be worth it, though pricier.

Installation Tips From My Experience

Installing a mullion can be straightforward if you prepare well. Here’s what helped me:

  • Clean the window frame thoroughly before starting.
  • Use the right sealants to prevent leaks around the mullion.
  • Follow the manufacturer’s instructions carefully.
  • If you’re unsure, consulting a professional can save time and trouble.

Final Thoughts

Choosing the right mullion for your camper window made a big difference in how secure and comfortable my camper feels. I hope my insights help you pick the best option for your needs. Remember, a little research and proper measurement go a long way!

Author Profile

Sarah Watson
Sarah Watson
I’m Sarah Watson, the voice behind Shop Quint. Before starting this blog in 2026, I spent several years working in retail merchandising, where I helped select, organize, and evaluate products before they ever reached customers. That experience shaped how I look at things today - not just how they appear, but how they actually perform once they leave the shelf. I studied business at a local college, but most of what I know comes from hands-on work and everyday use.

Now, I live a quieter life where I test products in real conditions and share honest, practical insights for people who want to make smarter buying decisions. I focus on what truly adds value, what lasts, and what isn’t worth the money. ShopQuint is my way of turning past experience into something useful - helping others choose with more clarity and confidence.