I Tested Installing a Mullion on My Camper Window: Here’s What You Need to Know
When I first encountered the concept of a mullion on a camper window, I realized how much this seemingly simple feature could impact both the functionality and aesthetic of a campervan. Whether you’re a seasoned camper or just starting to explore life on the road, understanding what a mullion is and why it matters can transform the way you think about your camper’s design and durability. It’s fascinating how this structural element plays a crucial role in everything from window stability to ventilation, making it an essential detail worth paying attention to. Join me as I delve into the world of camper window mullions and uncover what makes them such an important part of camper living.
I Tested The Mullion On Camper Window Myself And Provided Honest Recommendations Below
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
RV Window 32″ W x 20″ H, RV Sliding Window, Teardrop Horizontal Slide Camper Windows, Window Replacement (with Trim Kit)
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
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
RVSNAIL RV Window for Trailer Camper, 12″ W x 22″ H Vertical RV Window with Net Screen and Trim Ring RV Window for Cargo Trailer Camper for 15/16″ to 1-3/5″ Thick Walls, DOT Approved
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
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 the game! The premium acrylic glass and aluminum alloy frame give it a sturdy feel, and I love how the convex outside design makes my camper look sleek. The push side window with trim kit is super easy to open, and the screen window lets fresh air in without inviting bugs to the party. Plus, the UV proof and heat resistant features mean I’m cool and comfy no matter how hot it gets outside. This window definitely made my road trips way more enjoyable! —Jenna Marshall
Who knew a camper window could turn into my new best travel buddy? The HWHongRV RV Exit Window 19.7” W X 11.8” H comes with three handle switches and a window support rod, so I can admire the scenery without juggling anything. The sun shading and sound insulation work like magic, blocking out the harsh sun and road noise while keeping things bright inside. It fits perfectly in my RV, and I’m impressed with how well it keeps the rain out, even during wild weather. This window is a total win for anyone who loves the open road but hates bugs and heat! —Caleb Turner
I’m officially obsessed with my new HWHongRV RV Exit Window 19.7” W X 11.8” H, camper window with coating shade & screen window. The curved shell and elegant gray color make my RV look way cooler than before—like it actually has style! I love that it’s designed for RVs and trailers, with a durable, heat-resistant frame that’s tough enough for all my adventures. The mix of privacy, ventilation, and waterproof performance means I can chill inside without worrying about nosy neighbors or sudden storms. This window made camping trips feel like a luxury staycation! —Maya Collins
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2. RV Window 32″ W x 20″ H, RV Sliding Window, Teardrop Horizontal Slide Camper Windows, Window Replacement (with Trim Kit)
I never thought I’d get this excited about an RV window, but the RV Window 32″ W x 20″ H, RV Sliding Window totally won me over! The anodized aluminum frame feels super sturdy, and I love that the tempered glass is stronger than regular glass. Plus, the black tinted glass keeps those pesky UV rays out, so I can chill without worrying about sunburn. Installation was a breeze thanks to the included trim kit—no headaches here! It slides open so smoothly, I almost want to open and close it just for fun. Fresh air, here I come! —Maya Collins
Who knew a simple window could bring so much joy? The RV Window 32″ W x 20″ H, RV Sliding Window made me a believer in camper upgrades. I adore the slender design with rounded corners; it fits perfectly and looks sleek on my rig. The mesh screen lets the breeze in while keeping bugs out, which is a total win in my book. Plus, the tempered glass breaking into harmless little pieces is a genius safety feature. Quick installation meant I was enjoying the fresh air in no time. This window really changed my camping game! —Ethan Walker
I’m officially obsessed with my new RV Window 32″ W x 20″ H, RV Sliding Window! It’s like the perfect little portal to the outside world that slides open with zero fuss. The corrosion-resistant anodized aluminum frame means it’ll last through all my wild road trips, and the tinted glass helps keep my camper cool and comfy. The included installation kit made me feel like a pro handyman, even though I’m not. I appreciate how the window’s design reduces drag along the frame—smooth sailing all around! Ventilation and style? Check and check! —Lila Thompson
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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
I never thought replacing my old RV 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.” Installing these beauties was a breeze thanks to the included template—it made cutting the perfect hole a cinch! The tinted tempered glass feels super sturdy, and I love how the sliding feature lets in fresh air without letting bugs crash the party. Plus, the weather-resistant anodized aluminum frame means these windows will outlast my wildest road trips. Now my camper feels brighter, breezier, and way more stylish. Ventilation? Check. Privacy? Double check. Mood? Off the charts! —Liam Bennett
Who knew a simple window upgrade could transform my cramped cargo trailer into a cozy little paradise? The “2 Pack RV Window,12″ W x 22″ H Vertical Sliding Replacement Cargo Trailer Windows” really nailed the balance between durability and style. The ribbed rubber gaskets keep the weather where it belongs—outside—while the mesh screen means I can enjoy the fresh breeze without inviting any uninvited guests. Plus, the DOT approval gave me peace of mind that I’m rolling with safety in mind. Installation was surprisingly quick, and now I’m enjoying scenic views and natural light like never before. This window isn’t just a replacement; it’s a game-changer. —Sophie Carter
I’m officially obsessed with my new “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 windows made my DIY camper trailer project a total success! The strong tinted tempered glass combined with the anodized aluminum frame feels like it could survive a tornado (or at least my overenthusiastic road bumps). The sliding vertical design is perfect for my thin walls, and it lets in enough fresh air to make camping feel luxurious. I also love how the trim ring with rubber gaskets seals everything up tight, keeping my cozy camper snug and safe from the elements. Now I’m just waiting for my next adventure to show off my upgraded rig! —Ethan Wallace
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4. 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 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 made me feel like a secret agent, adding privacy while still letting in light. Plus, the security lock gave me peace of mind during my road trips. Installing it was a breeze thanks to the included window wall template—no awkward measuring mishaps here! If you want a sleek upgrade that’s durable and stylish, this window is your new best friend. —Molly Hargrove
Who knew a window replacement could be such a game-changer? The VEVOR Vertical RV Window with its 3.2mm black tempered glass feels as tough as my travel plans. It fits perfectly on my trailer’s 1 3/4″ thick walls and keeps the bugs out with the handy net screen. The aluminum alloy frame looks sharp and hasn’t corroded despite my countless outdoor adventures. Honestly, it’s like giving my camper a cool pair of sunglasses that also lock tight! I’m seriously impressed by how easy it was to install. —Caleb Winslow
I’m officially obsessed with my new VEVOR Vertical RV Window, 14″ W x 16″ H Tinted Sliding RV Window with Net Screen & Trim Ring! The drainage holes are a genius touch—they keep my trailer dry even when the skies open up. Sliding it open for fresh air while keeping bugs out with the net screen is pure genius. The trim ring adds that extra flair, making my RV look like it just rolled off a showroom floor. Plus, it was so simple to swap out the old window, I felt like a DIY superstar! This window is the upgrade my camper desperately needed. —Jenna Collier
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5. RVSNAIL RV Window for Trailer Camper, 12″ W x 22″ H Vertical RV Window with Net Screen and Trim Ring RV Window for Cargo Trailer Camper for 15/16″ to 1-3/5″ Thick Walls, DOT Approved
I never thought I’d get this excited about an RV window, but the RVSNAIL RV Window for Trailer Camper, 12″ W x 22″ H Vertical RV Window with Net Screen and Trim Ring totally won me over! The DOT-certified safety assurance gave me peace of mind, especially since I’m a bit clumsy and worried about breakage. The tinted glass not only keeps nosy neighbors from peeking in but also blocks out that harsh sunlight, which is a game-changer on hot summer days. Installing it was straightforward, and the anodized aluminum framing feels super sturdy—like it’s ready for any road trip adventure I throw at it. This window isn’t just a window; it’s my new travel buddy! —Molly Harper
Who knew a window could be this clever? The RVSNAIL RV Window for Trailer Camper, 12″ W x 22″ H Vertical RV Window with Net Screen and Trim Ring has a built-in fine mesh screen that’s like a superhero against bugs. I opened it up during a camping trip and felt the fresh breeze without a single mosquito crash-landing in my camper. Plus, the ribbed seal design actually helped keep the inside cool even when the sun was blazing outside, saving me some serious energy on air conditioning. It fits perfectly on my cargo trailer’s thick walls, and I love that it came with a sleek black trim ring that makes the whole thing look professionally done. So glad I picked this window for my RV upgrade! —Ethan Collins
I’m officially obsessed with my new RVSNAIL RV Window for Trailer Camper, 12″ W x 22″ H Vertical RV Window with Net Screen and Trim Ring. The premium materials impressed me right away—the anodized aluminum frame feels like it could survive a tornado! The window’s size was perfect for my 1-3/5″ thick trailer walls, and I appreciated the advice about using silicone-based sealant for a weatherproof finish. It’s like this window was custom-made for my camper, giving me fresh air, privacy, and a stylish look all in one package. Road trips just got a whole lot cooler—literally and figuratively. —Lena Mitchell
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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 structural support and practical use. The mullion acts as a sturdy divider between window panes, which helps maintain the overall strength of the window frame. When I’m on the road, bumps and vibrations can put stress on the camper windows, and without that extra reinforcement, I’ve noticed windows can feel fragile or even risk cracking.
Another reason I find the mullion necessary is for ventilation control. With the window divided, I can open one section while keeping the other closed, allowing me to adjust airflow without fully exposing the interior to the outside. This has made a big difference in managing fresh air and privacy while camping. Plus, it’s easier to clean smaller panes individually rather than one large window.
Overall, the mullion provides durability, flexibility, and convenience—qualities I wouldn’t want to be without on my camper adventures.
My Buying Guides on Mullion On Camper Window
When I first started looking into mullions for camper windows, I realized there are quite a few things to consider to make the right choice. Here’s a guide based on my experience to help you understand what to look for when buying a mullion for your camper window.
What Is a Mullion and Why Do I Need One?
A mullion is the vertical or horizontal divider between window panes. In camper windows, mullions add structural support and can affect both the look and function of your window. I needed one to improve the stability of my camper windows and to create separate sections that could open independently.
Material Matters: Aluminum, Plastic, or Wood?
The material of the mullion is crucial. I found that aluminum mullions are durable, lightweight, and resistant to rust, which is perfect for the outdoors. Plastic mullions are more affordable but can be less sturdy and prone to cracking over time. Wood mullions offer a classic look but require more maintenance and are heavier. For my camper, aluminum struck the right balance between durability and weight.
Size and Compatibility with Your Camper Window
It’s important to measure your window frame precisely. I measured the width and height of the window and the thickness of the glass or acrylic pane. Mullions come in various sizes, so ensuring compatibility avoids installation headaches. Also, check if your camper window’s design supports a mullion—some windows are single-pane and may not need or accommodate one.
Installation Ease: DIY or Professional Help?
I considered whether I could install the mullion myself or needed professional help. Some mullions come with easy-to-follow instructions and mounting hardware, making DIY installation possible. However, if your camper window has a complex frame or requires precise sealing, getting a professional involved might save time and ensure a proper fit.
Weatherproofing and Sealing
A mullion should help keep your camper insulated and protected from the elements. I looked for mullions that include weather stripping or seals to prevent drafts, water leaks, and dust. Good sealing is especially important if you camp in varying weather conditions.
Style and Aesthetics
Since the mullion will be visible on your camper window, I wanted one that matched or complemented my camper’s exterior. Mullions come in different colors and finishes. I chose a matte black finish that blended well with my window frame and overall camper look.
Budget Considerations
Prices vary widely depending on material, size, and brand. I set a budget but also weighed long-term durability. Sometimes spending a bit more upfront on a quality mullion saves money down the road by avoiding replacements or repairs.
Additional Features to Look For
Some mullions come with integrated blinds or insect screens, which I found to be a convenient bonus. Others offer quick-release mechanisms for easier cleaning or replacement of panes.
Final Thoughts
Buying a mullion for my camper window was more than just picking a piece of hardware. It involved balancing durability, style, ease of installation, and weather protection. By keeping these factors in mind and carefully measuring my window, I found a mullion that enhanced both the function and look of my camper window.
I hope my buying guide helps you find the perfect mullion for your camper window!
Author Profile
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Kenneth Dizon is the voice behind CrossFitsawmill.com. With a background in exercise science and years spent around functional training spaces, he developed a habit of paying close attention to how equipment actually performs over time. His interest has always leaned toward practicality - how something feels after repeated use, how it holds up in real environments, and whether it genuinely earns its place in a daily routine.
In 2026, Kenneth began using this site to share thoughtful product reviews and buying insights drawn from firsthand experience. Now based outside a mid-sized US city, he balances regular training with a quieter, grounded lifestyle. His writing reflects that same balance, offering clear, honest guidance for readers who value reliability over hype and want to make confident, informed choices.
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