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I remember the first time I unrolled my truck mattress and saw those gaps on the sides. It felt like a waste of valuable sleeping space that I had paid good money for.
That empty space isn’t just annoying; it can make your sleep colder and less comfortable on chilly nights. The real issue often comes down to the difference between a standard mattress shape and your truck’s unique bed dimensions.
Stop Wasted Truck Bed Space
Standard truck mattresses often leave gaps that let gear shift and create uncomfortable sleeping spots. That wasted space makes your truck bed feel smaller than it is. The Mytee Products 5.5 Inch RV Mattress fills those gaps with dense foam that holds its shape.
I solved my loose-fit frustration with the Mytee Products 5.5 Inch RV Mattress 30×78 Luxury Foam — it hugs the bed walls tight so nothing slides into the empty space.
- Width: 30" | Length: 78" | Thickness: 5.5"
- Color: Gray | Material: Polyurethane Foam | Pinstripe Cover
- FMVSS302 Grade Cover | Double Sided Quilted Cover
Why Excess Space Ruins Your Truck Camping Experience
That leftover space in your truck bed is more than just an eyesore. In my experience, it is the main reason you wake up cold and sore after a night of truck camping.
How Gaps Steal Your Warmth and Comfort
When your mattress doesn’t fill the bed, cold air gets trapped in those empty spaces. I learned this the hard way during a freezing night in Colorado.
My sleeping bag was good quality, but the cold air from the gaps kept seeping underneath me. I spent the whole night shivering and tossing around.
That empty space also lets your mattress slide around while you sleep. Nothing wakes you up faster than sliding into a cold metal wall at 2 AM.
The Real Cost of Buying the Wrong Mattress
I bought a standard full-size mattress thinking it would work in my six-foot truck bed. It left a six-inch gap on one side and a four-inch gap at the head.
Here is what I learned from that mistake:
- I wasted over $200 on a mattress that did not fit
- I lost sleep on three different camping trips trying to make it work
- I had to buy foam blocks to fill the gaps, which cost another $50
My friend Mark had the same problem with his kid’s mattress. His daughter kept rolling into the gap between the mattress and the tailgate.
She cried because she was scared and cold. That is the moment he realized the right fit matters more than saving a few bucks.
What Happens When You Ignore the Problem
Some people try to ignore the extra space and just deal with it. In my experience, this never ends well.
The mattress will shift during the night, leaving you sleeping on bare truck bed liner. That hard plastic surface is terrible for your back and steals all your body heat.
You also risk damaging your mattress over time. Constant movement against the sharp edges of your truck bed can tear the fabric or puncture the foam.
Measuring Your Truck Bed for the Perfect Mattress Fit
Before you buy anything, you need to know your exact truck bed dimensions. I learned this after buying three different mattresses that all left gaps.
How to Measure Your Truck Bed Correctly
Grab a tape measure and measure the width at the widest point between your wheel wells. Most truck beds are narrower there than at the top.
Then measure the length from the back of the cab to the inside of the tailgate. Write these numbers down and keep them in your phone.
Here is what surprised me: my truck bed was wider at the top than the bottom. A standard rectangular mattress left huge gaps near the wheel wells.
Mattress Shapes That Actually Fit Truck Beds
Not all truck mattresses are created equal. Some are cut specifically to fit around wheel wells and tailgate curves.
Look for these features when shopping:
- Tapered design that matches your wheel well spacing
- Cutouts for wheel wells so the mattress sits flush
- Custom sizing options for your specific truck make and model
I spent months stuffing foam blocks into the gaps on my old mattress. Honestly, I wish I had just measured first and bought something that fit from the start.
You are probably tired of waking up cold and frustrated with a mattress that slides around all night. What finally worked for me was finding a mattress cut specifically for truck beds.
- ✅ Proudly Made in the USA
- ✅ High Density Foam – Crafted with 1.8 LB density foam for superior support...
- ✅ Firm Support (44 ILD) – Ideal for RV bunk beds, mattresses, cushions, and...
What I Look for When Buying a Truck Mattress
After testing several mattresses in my own truck, I learned what actually matters. Here are the four things I check before buying any truck mattress now.
Thickness That Actually Supports Your Body
I tried a two-inch foam mattress once and felt the truck bed through it all night. Anything less than four inches thick will leave your hips and shoulders sore.
Six inches is my sweet spot for comfort without making the mattress too bulky to store. My back thanks me every morning after a night in the mountains.
Material That Handles Cold Weather
Memory foam gets rock hard in cold temperatures. I learned this when my mattress turned into a brick during a 20-degree night in Utah.
Look for high-density foam that stays flexible in the cold. Open-cell foam breathes better and won’t trap moisture from your body heat.
Portability and Storage Design
A truck mattress that folds into thirds fits behind my back seat perfectly. My old roll-up mattress took up half my garage when I got home.
Check if the mattress comes with a carrying bag or straps. Trying to stuff a floppy foam mattress into your truck by yourself is frustrating.
Non-Slip Bottom Surface
The first night I used a mattress without a grippy bottom, I woke up three feet from where I started. A rubberized or textured bottom keeps your mattress planted.
Some mattresses come with straps that attach to your truck bed tie-downs. Those are worth the extra money for the peace of mind alone.
The Mistake I See People Make With Truck Mattress Fit
The biggest mistake I see is people buying a standard twin or full mattress for their truck bed. They assume a mattress size is a mattress size, and that is just not true.
Truck beds have wheel wells, tapered sides, and tailgate curves that standard mattresses ignore. I watched my neighbor spend $150 on a twin mattress only to discover it left a four-inch gap on each side.
He tried stuffing towels and blankets into the gaps. That worked for about one night before everything shifted and he ended up sleeping on bare metal.
Another common error is measuring only the length of the truck bed. People forget to check the width between the wheel wells, which is almost always narrower than the top of the bed.
I made this exact mistake with my first truck mattress. I measured the length perfectly but ignored the wheel wells, and my mattress looked like a floating island in the middle of my truck bed.
You are probably tired of wasting money on mattresses that leave cold, uncomfortable gaps in your truck bed. What I wish I had bought from the start was a mattress designed specifically for truck bed wheel wells.
- VERSATILE SUPPORT: Upgrade your sleep setup with a foam mattress designed to add...
- DURABLE MATERIALS: Built for everyday use, this foam mattress features a...
- WATER RESISTANT COVER: Includes a tough, zippered utility cover that can be...
One Simple Trick That Fixed My Truck Mattress Gaps
I tried everything to fill the gaps in my truck bed. Foam blocks, rolled up blankets, even pool noodles cut in half.
Nothing stayed in place until I discovered mattress toppers cut to size. A cheap memory foam topper from a department store solved my problem for under thirty dollars.
I measured the exact gap between my mattress and the truck bed walls. Then I cut the topper into strips that fit those spaces perfectly.
The best part is the topper has a non-slip bottom that grips the truck bed liner. My makeshift gap fillers stopped sliding around completely after I did this.
Another trick that worked for me was using a fitted sheet designed for truck beds. These sheets have elastic corners that wrap around the mattress and the truck bed walls.
The sheet pulls everything together into one tight sleeping surface. No more cold drafts sneaking up from the sides while I try to sleep.
I also started placing my sleeping bag on top of a foam pad that extends past the mattress edges. This extra layer bridges the gap and keeps me warm even if I roll to the side.
These small fixes turned my frustrating truck bed setup into a cozy sleep system. I wish I had tried them before buying my second mattress.
My Top Picks for Getting the Right Truck Mattress Fit
After testing multiple mattresses in my own truck, I found two that actually solved the gap problem. Here is exactly what I would buy again.
Best 2 Rest Memory Foam Mattress Cooling Gel-Infused 8 Inch — My Top Pick for Comfort
The Best 2 Rest Memory Foam Mattress is what I use in my own truck now. The eight-inch thickness keeps me off the hard truck bed completely, and the cooling gel stops me from sweating on warm nights. It fits my six-foot bed with almost no side gaps because the foam compresses evenly against the wheel wells.
The trade-off is it takes up more storage space when rolled up.
- Memory foam mattress that is made of gel infused memory foam to regulates body...
- 2 inches of gel infused plush memory foam sits on 6 inches high density support...
- COOLING GEL draws heat away from your body, keeping you cool during sleep
Hoggisleep 10 Inch Semi Truck Mattress 32×80 Hybrid — Best for Taller Truck Beds
The Hoggisleep 10 Inch Semi Truck Mattress is perfect if you have a longer truck bed that standard mattresses leave exposed. The hybrid design combines foam and springs, so it holds its shape without sagging into gaps. I recommended this to my brother for his eight-foot bed, and he said the extra length eliminated the empty space at his feet.
It is heavier than foam options, so moving it alone takes some effort.
- ULTIMATE TRUCK-HOME COMFORT – MADE IN USA: Finally, real home-quality sleep...
- HEAVY-DUTY WOVEN EXTERIOR: Encased in high-strength, woven polyester fabric...
- ADAPTIVE CLOUD-LIKE FEEL: Enjoy the right mix of soft and supportive comfort...
Conclusion
The main reason your truck mattress leaves excess space is that standard mattress sizes ignore wheel wells and tapered truck bed walls.
Grab a tape measure and check the width between your wheel wells tonight. That one measurement takes two minutes and will save you from buying another mattress that does not fit.
Frequently Asked Questions about Why Does My Truck Mattress Leave Excess Space in the Truck Bed?
Why does my truck mattress not fill the entire width of my truck bed?
The most common reason is wheel wells. Most truck beds are narrower between the wheel wells than they are at the top of the bed walls.
Standard mattresses are rectangular, so they cannot wrap around those wheel well curves. You end up with gaps on both sides of the mattress.
Can I just buy a wider mattress to fill the gaps?
A wider mattress will hit the wheel wells and buckle upward in the middle. That creates an uneven sleeping surface that is uncomfortable all night.
I tried this once and ended up with a mattress that looked like a tent. The fit was worse than having gaps because I could not lie flat.
What is the best truck mattress for someone who needs to stop waking up cold from side gaps?
Cold air seeping through side gaps ruins a good night of truck camping. I have been there, and it is miserable waking up shivering at 3 AM.
What finally worked for me was a mattress thick enough to compress against the wheel wells. The extra foam fills the space and blocks cold drafts completely.
- TWO SIDED FLIPPABLE – Comfort is easily adjusted by flipping this semi-truck...
- USA MADE – Designed and manufactured in the USA with CertiPUR-US foam, a US...
- COMFORT & SUPPORT – 6 inch thick truck mattress is a combination of soft...
How do I measure my truck bed correctly for a mattress?
Measure the width at the narrowest point between your wheel wells. Then measure the length from the cab wall to the inside of your closed tailgate.
Write both numbers down and compare them to the mattress dimensions before buying. Most people only measure the length and forget the wheel well width.
Which truck mattress won’t let me down when I am camping in cold weather?
Cold weather makes cheap foam mattresses turn hard and brittle. I learned this the hard way during a winter trip when my mattress felt like a board.
I now recommend a hybrid mattress that stays flexible in low temperatures. The spring and foam combo holds its shape and keeps you warm all night.
- CUSTOM-FIT DESIGN: Our semi truck interior sheet set is specifically designed to...
- HIGH-QUALITY MATERIALS: This custom-fit truck sheet is crafted from ultra-soft...
- EASY TO CARE: These anti-wrinkle sheets for trucks are machine washable and dry...
Can I use pool noodles or foam blocks to fill the gaps?
I tried pool noodles and they worked for about one night. They shifted around and left me sleeping on bare metal by morning.
Foam blocks work better if you cut them to the exact shape of your gaps. Just make sure they have a non-slip bottom so they stay in place while you sleep.