RV SAFETY REPORT

I Spent 14 Years Signing Off On RVs. The Detector That Came With Yours Was Built To Stay Silent Until It's Almost Too Late.

"The green light was still glowing. That light tells you almost nothing."

— Frank Whitaker, retired RV service writer, 14 years

Title

Frank W.

Updated: February 24, 2026

6 min read

The Call I Can't Forget

I sold and serviced RVs for fourteen years in Elkhart, Indiana. The RV capital of the world.

Hundreds of rigs out the door every year. I knew the systems. I knew which suppliers cut corners.

I never thought twice about the cheap little box mounted low by the floor.

Then came a Monday morning in October 2022.

I'd just set my coffee down when the service line rang.

"Is this the guy who checks the rigs before they go out?"

I said it was. His name was Tom. He'd bought a used Class C off our lot back in the spring. I remembered the sale.

He didn't sound angry. That's the part I'll never forget. He just sounded tired.

"I need you to tell me what failed," he said. "I'm not looking to sue anybody. I just need to know."

He'd taken his wife and her elderly mother out to South Dakota over Labor Day. Four nights at a campground.

On the third morning, his wife went to wake her mother for breakfast.

She didn't wake up.

Carbon monoxide. A cracked exhaust vent on the propane water heater. Invisible. Odorless.

It had pooled near the floor where she slept and built up over three nights.

She'd been gone over an hour by the time anyone knew.

"Why Didn't It Go Off?"

Tom drove that rig four hundred miles back to Elkhart. Pulled into our lot two days later and asked for me by name.

We walked out to it together. I had my meter in my hand. He stood back with his arms crossed, watching me.

The detector was right where it always is. Down low, by the floor. Green light on.

I reached over and pressed the test button.

It beeped. Loud and clear. Same sound it made the day he drove off our lot.

"That's supposed to keep us safe," he said. "Why didn't it go off?"

I turned it over in my hands and checked the date on the back.

Manufactured a couple years before Tom ever bought the rig. Still well within its service life.

It wasn't expired. It wasn't broken. The sensor was fine. The battery was fine. The speaker worked.

It had done everything it was built to do. And the woman in that bunk was gone.

I told Tom I'd look into it. He nodded, shook my hand, and drove home in the same rig he'd lost her in.

I stood in that empty lot for a long time after he left.

Because I'd pressed that same test button myself, the day we sold him the rig. I'd heard it beep. I'd checked the box.

And I had no idea why it hadn't saved her.

So I started asking questions. What I found over the next few months made me sick.

I'm going to tell you what I learned. Because every word of it is true of the detector sitting in your rig right now.

The Truth That Turned My Stomach

I pulled the parts manuals. I called a manufacturer rep I'd known for ten years and asked him straight.

"Why didn't Tom's alarm go off? The leak was real. The CO was there."

He got quiet. Then he said, "Because it wasn't at 70 yet."

"70 what?"

"Parts per million. That's the threshold. The alarm doesn't have to make a sound until CO hits 70 PPM."

I'd been selling these things for fourteen years and I'd never heard that number.

So I asked him the question that still keeps me up.

"What's happening to a person before it ever hits 70?"

He didn't sugarcoat it.

"By 50 you're already feeling it. Headache. Fatigue. That foggy, can't-think feeling. If you're awake, you might blame the drive, or the altitude. If you're asleep..."

He stopped there.

That was the part that got me. The danger doesn't start at 70.

70 is just the number where the alarm finally bothers to speak up. Your body started paying the price long before that.

And even at 70, the standard allows the alarm to take between 60 and 240 minutes to respond.

Sixty to two hundred and forty minutes. At a level that's already poisoning you in your sleep.

The standard wasn't written to save your life. It was written to cut down on false alarms.

Tom's mother-in-law breathed that air for three nights. The alarm did exactly what it was designed to do.

Nothing.

The production date stamped on the back. Brand new, working perfectly. And still it stayed silent.

Then there's the test button.

I'd pressed it thousands of times. I thought I was confirming the thing could smell carbon monoxide.

I was confirming nothing of the kind.

I learned this on a unit sitting on my own workbench. I had a calibrated CO source. I held it right up to an alarm with a good green light and a button that beeped perfect.

The reading climbed. 40. 60. 80 PPM.

The alarm sat there. Silent. Green light glowing the whole time.

That test button only checks the battery and the speaker. It never once checks whether the sensor can still detect gas.

The sensor can be stone dead from age, and the button will beep just as loud as the day it left the factory.

Every owner pressing that button at home once a month thinks they're testing their protection.

They're testing a flashlight and a buzzer.

And here's the part almost nobody knows: CO sensors wear out after 5 to 7 years. When they do, the green light keeps glowing anyway. No warning. It just quietly stops being able to protect you.

Green light on. Test button working. The sensor may have been dead for years.

3 AM — I Pulled Every Detector Out Of My Own Rig

I worked another sixteen months after that day with Tom.

Every used rig I signed off on, I pressed that test button knowing exactly what it didn't do.

I told myself I'd say something. Bring it up at a sales meeting. Talk to the owner.

I never did. I had a mortgage and two years to retirement, and I told myself it wasn't my call.

I retired in December 2024.

The first thing I did when I got home wasn't pour a drink or sit down.

I walked straight out to my own Class C, reached up, and pulled the detector off the wall with my bare hands.

Same kind of box that was in Tom's rig. Same green light glowing. The one I'd trusted for years.

If a real leak ever came, this thing wouldn't have warned me until it was almost too late.

Just like Tom's.

I held it in my hand out there in the dark and thought about that bunk in South Dakota.

Then I went inside, sat at the kitchen table, and started looking for something that actually worked.

It's Watching The Wrong Height

Here's the part that really got me, as an RV guy.

The detector that came with your rig sits down low, near the floor. And for propane, that's exactly right. Propane is heavier than air, so it sinks. Down low is where you want to catch a propane leak.

But carbon monoxide doesn't sink.

CO is lighter than air. It rises, up to where you're sitting, up to where your head is on the pillow, up to the height you're actually breathing while you sleep.

So that detector by the floor? For CO, it's watching the wrong height.

By the time enough carbon monoxide sinks low enough for a floor unit to take it seriously, the air up where you're breathing has been dangerous for a long time already.

That's why the guys who know this stuff mount CO protection up at breathing level, four to six feet off the floor. Right where the air you're actually breathing is.

What The Long-Haul Guys Actually Run Now

I got on Facebook that night, into the groups where the full-timers and the retired guys hang out, and I asked them straight.

What are you actually running?

Same answer, over and over.

Get one with a screen. One that shows you a real CO number. And get it up off the floor, up where you actually breathe.

Three or four of them named the same unit. Nexvur. A 6-in-1.

Carbon monoxide. Propane. Natural gas. Smoke. Plus temperature and humidity.

Plugs into a standard outlet, up at breathing height. Backup power for when shore power drops or you're boondocking.

I ordered one that night. It came on a Wednesday.

I plugged it in, and the screen lit up with a number.

CO: 0.

Not a green light I had to trust. Not a button I had to believe. A number, telling me what was in the air right then, that second.

I stood in my own rig and looked at it for a long time.

Fourteen years. Hundreds of rigs. And I had never once, in all that time, looked at a real carbon monoxide number until that moment.

A real CO reading. Not a green light I had to trust.

The Trip That Proved It

Last summer I ran into a couple at a campground near the Smokies. Bill and Carol.

Bought a used travel trailer a couple months earlier.

Carol was telling my wife she couldn't sleep at night. Kept waking up, worrying about the propane, sniffing the air like that would tell her anything.

I asked Bill if I could see his detector.

He pulled it off the wall and handed it to me. Green light on, of course. I turned it over.

Manufactured 2018. Replace-by date gone for more than a year.

"This thing's been dead weight on your wall for over a year," I told him. "And even when it was new, it was sitting in the wrong spot, waiting for a number you never want to reach."

I told them everything I just told you. The 70. The button. The height.

Bill ordered the same unit I run. It caught up to them at their next campsite.

A couple weeks later he sent me a photo of the screen. CO: 0. Gas: 0.

Underneath it he wrote:

"Carol slept through the whole night for the first time since we bought this thing. She can see it's safe now. So can I."

Same propane. Same kind of rig. The only difference was what was on the wall.

Why I Can't Keep Quiet About This

I signed off on hundreds of rigs and told those families they were safe.

I pressed that button. I checked the box. I never told a single one of them what I just told you.

I think about Tom on the phone. About that bunk in South Dakota.

About all the rigs I sent out the door with a green light glowing on the wall and a sensor that couldn't save anybody.

The difference between those two outcomes is usually less than the cost of one night at a campground.

⚠ DO THIS BEFORE YOU CLOSE THIS PAGE

Go Look At Your Own Detector. Right Now.

1. Walk out to your rig and take the detector off the wall.

2. Turn it over. Find the manufacture date and the replace-by date.

3. If that date has passed — or you bought the rig used and never replaced it — that detector is just a glowing light.

The button still beeps. The light still glows.

The sensor may have been dead for years.

Most RV owners have never once checked that date.

Here's What Changes The Day It Arrives

You plug it into the wall, up at breathing height. The screen lights up.

And for the first time, you're not staring at a green light, wondering what it actually means.

You see the carbon monoxide level. An actual number, right there on the screen, updating in real time.

Not a light that might mean you're safe, or might mean the sensor died two years ago.

And if gas or smoke ever shows up, you don't get a quiet little chirp.

You get a 100dB alarm that gets the whole rig on its feet, even over a running generator at 2 AM.

That's not hoping you're safe. That's seeing it.

You're Not Risking Anything To Find Out

I get it — you've been burned by cheap gear before.

So here's what Nexvur stands behind:

60-Day Money-Back Guarantee — plug it in, live with it for two months. If it's not the peace of mind I'm describing, send it back for a full refund.

3-Year Warranty — anything goes wrong, they make it right.

Free Shipping on multi-packs — comes ready to plug in. No tools, no wiring, no ladder.

The only thing you're risking is another trip with a detector that might already be dead.

Here's what I keep coming back to, after fourteen years.

Tom's detector wasn't expired. It wasn't broken. It was working perfectly the whole time.

It still sat there silent. Still waited for a number it was allowed to ignore. Still guarded a corner four feet below where she slept.

So this isn't about whether yours is old or new. New ones do the exact same thing.

They wait until 70. They sit by the floor. They show you a light instead of a number.

Tonight, someone you love is going to sleep in that rig, trusting that little green glow on the wall.

You can keep hoping it means something.

Or you can see for yourself, with a real number, what's actually in the air around them.

Nexvur

6 In 1 CO Detector

4.8

|

Trusted by RV families across the country

See it, don't guess it — a real carbon monoxide reading on the screen

One device watching what matters — CO, gas, and smoke

A 100dB alarm that actually wakes you — even over a running generator

Keeps watching when the power doesn't — for boondocking and shore-power drops

Plugs in at outlet height — right where you breathe, not down on the floor

APPLY DISCOUNT AND CHECK AVAILABILITY

60-Day Money-Back Guarantee · Free Shipping For 2-Pack · 3-Year Warranty

What Other RV Families Are Saying

Roy Halverson

Lost a buddy last month. Found him in his camper. They're saying it was CO, that he went in his sleep. Damn near 40 years we went fishing together. He had one of those detectors on the wall too, green light and all. That's what did it for me. I'm done trusting a little light. Got one that shows me the actual number now.

48

James Smith

People don't realize how fast CO builds up in something as small as a camper. There's nowhere for it to go. Seeing the real number instead of trusting a green light changed how safe I feel out there.

45

Gary Whitfield

50 or 60 PPM is already dangerous, especially for older folks and the grandkids riding along. But the unit that came with our trailer stays silent until 70. That's what made me switch. I want to see it coming, not get woken up when it's too late.

28

Troy Mitchell

Propane is heavier than air, that's why the factory alarm sits near the floor. But CO is lighter, it rises. My old setup had the CO alarm down low with the propane one. Wrong spot for CO. You want CO up around eye level, about five feet up, where you're actually breathing.

39

Carol Mercer

Never felt right about the factory detector in our motorhome. After a couple passed in their camper from CO, I ordered one of these. Now I see the real number and finally sleep at night.

23

Michael Miller

We camp with our grandkids every summer and I've always had that quiet worry in the back of my mind, especially at night when we're sleeping in a closed rig. Plugged this in and for the first time I could actually see the air was clean. That worry is just gone now.👍

12

Marlene Kittle

Learned this the hard way after a scare last fall. The factory detector by the floor never said a word, but my husband woke up with a headache three mornings straight. Got one that sits up at outlet height now and shows the actual number. Wish we'd known about the height thing years ago.

16

Sharon Delgado

Getting one for our camper and a couple for the house too, especially now that I know the old ones wait until levels are already pretty high before they alarm. No sense trusting that green light any longer.

14

I signed off on hundreds of rigs and never told a single family what I just told you.

I'm telling you now.

Don't spend another trip hoping a green light means something. See what's in the air around the people you love. 🙏 — Frank

Protect My Family Before The Next Trip >>

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