I've installed a Train Horn for Milwaukee® 18v Battery on Rangers, Colorados, a Frontier, and a buddy's Gladiator, and midsize trucks are where skipping the air tank makes the most sense. Here's where the horn rides in each truck, and why I stopped trying to fit compressors under them.
Why Midsize Trucks Fight Traditional Train Horn Kits
A conventional train horn kit wants three things bolted under the truck: a tank, a compressor, and trumpets. Then you run air line and a 12V relay. On a half-ton there's usually room under the bed to hide all that. On a midsize there often isn't, and the install write-ups show it.
- Chevy Colorado: In a well-documented Kleinn install on a 2016 Colorado diesel, the 3-gallon slim tank needed custom strap brackets on a crossmember. The compressor went on the passenger-side frame rail. One trumpet needed the frame rail drilled and tapped. The tank bracket then had to be modified to lift it away from exhaust heat.
- Ford Ranger: Ranger5g forum members end up fabricating too. One owner built a mount that clamps around the frame rail and squeezed the tank and compressor into the driver-side space ahead of the fuel tank.
None of that is wrong. Those are clean builds by people who know what they're doing. But it's a weekend of fab work and drilling, all to hang a pressure vessel close to the exhaust on a truck that has less room underneath to begin with. That's the reason I moved my own midsize builds to a self-contained horn.
What a No-Wiring Horn Changes on a Midsize
An M18™-compatible train horn has the compressor, valve, and trumpets in one unit, and it runs on any Milwaukee® M18™ battery. Nothing goes under the truck, nothing ties into the factory harness, and nothing sits next to the exhaust. On a midsize that means you lose no ground clearance and nothing hangs down to catch on rocks, and your skid plates and spare stay exactly where they are. If you're worried about the dealer, I covered that in whether a train horn voids your truck warranty.
For midsize trucks I run the Extreme Quad Train Horn for Milwaukee® 18v Battery. It has four metal trumpets, puts out up to 150 dB, and comes with a standard remote good to about 160 ft plus a long-range remote rated up to 2000 ft. The battery is sold separately, which is fine if you already have M18™ packs in the toolbox. I'd use a 5.0Ah pack or bigger, and I break down the battery choice in the best M18 battery for a train horn.
Ford Ranger (2024+): One Short Box, Plenty of Width
The current Ranger in the US is SuperCrew only, with a 5-foot box. That box measures 59.6 inches at the floor and 48.2 inches between the wheelhouses, which makes it the widest between the wheel wells of anything in this guide. That width means the horn can sit sideways in the front corner and you still have room to lay a cooler or a toolbox flat behind it.
- Daily setup: Front driver-side corner, strapped to the tie-down, trumpets aimed out over the bed side.
- Raptor or off-road builds: If you run a bed rack, mount it up high on the rack. The higher the trumpets, the farther the sound carries, and you'll want that on a trail.
- With a tonneau: Ride it in the cab behind the rear seat and fire it handheld out the window. I go through cab storage options in where to store and carry a handheld horn.
Chevy Colorado and GMC Canyon (2023+): Same Box, Same Plan
The current Colorado and Canyon share a short box that's 61.7 inches long at the floor and 45.5 inches between the wheel housings. Both trucks come only with the short box now, so whatever works in one works in the other.
The Colorado install I mentioned above is a big reason I'm sold on this layout. Mounting the tank on the crossmember and then moving it away from the exhaust is just what happens when there isn't much room under a midsize. With a battery horn you skip that problem completely. On a Colorado or Canyon I put the horn in the front corner ahead of the wheel well, on the side opposite whatever you carry most. If you've got a ZR2 or AT4X with a rack, it goes up high, same as on the Ranger.
Nissan Frontier: Two Beds and Rails That Help
The Frontier comes with a 5-foot bed at 59.5 inches of floor or a 6-foot bed at 73.3 inches. Both measure 44.5 inches between the wheel wells. For 2025, Nissan added a long-wheelbase Crew Cab with the 6-foot bed, so crew-cab owners get the longer box now too.
What makes the Frontier easy is the Utili-track system. It's a set of channels with sliding cleats along the bed, so you can move your tie-down points without drilling. I slide two cleats up to the front of the bed, run a cam strap through the horn's handle, and it doesn't move. When I want the bed clear, the cleats slide back and the horn goes in the cab.
Jeep Gladiator: A Truck Bed With Jeep Habits
The Gladiator has a 5-foot steel bed that measures 60.3 inches with the tailgate closed. It comes with four tie-down loops that fold flush into the wheel wells, and there's an optional Trail Rail system along the front and side walls. Strap the horn to the front loops or a Trail Rail cleat and it's set.
But a Gladiator owner is going to want it up on the roll bar sooner or later, and that's a great spot for trail use. The roll-bar and cage mounting I described for the Wrangler works the same on a Gladiator, and you'll find it in how to mount the horn on a Jeep. If you've also got a Bronco in the driveway, those mounting spots are in the Ford Bronco mounting guide. One thing to watch: with the top off, the horn and an expensive M18™ pack are easy for anyone to grab. My lock-down routine is in keeping the horn and battery from being stolen.
Midsize Bed Cheat Sheet
| Truck | Bed (inside length at floor) | Between wheel wells | Where I put the horn |
|---|---|---|---|
| Ford Ranger (2024+ SuperCrew) | 5 ft: 59.6" | 48.2" | Front corner on the tie-down, or up high on a bed rack |
| Chevy Colorado / GMC Canyon (2023+) | Short box: 61.7" | 45.5" | Front corner ahead of the wheel well |
| Nissan Frontier | 5 ft: 59.5" / 6 ft: 73.3" | 44.5" | Front of bed on Utili-track cleats |
| Jeep Gladiator | 5 ft: 60.3" (tailgate closed) | Check yours | Front tie-down loops, Trail Rail, or the roll bar |
Every one of these beds has room for the horn with space left over. What matters more is how you strap it down and how high you can get it. It's the same idea I used for the Tacoma, Tundra, and 4Runner, and it works on these trucks too.
Which Sound Tier for a Midsize Truck?
Every M18™-compatible train horn we build comes in three tiers: Dual at 130 dB, Quad at 140 dB, and Extreme at 150 dB and up. For a midsize used mostly on the street and the highway, a Quad is plenty. If your Ranger, Colorado, or Gladiator spends weekends on trails, in the desert, or around loud equipment, go Extreme.
Safety, because I mean it: OSHA guidance says impulse or impact noise shouldn't go over 140 dB peak. A midsize cab is small, so don't fire a 150 dB horn inside it with the windows up, and never point it at people near the truck. Loud is a feature — install it right.
FAQ
Will a train horn fit under a midsize truck with my skid plates?
With a battery horn you don't have to find out. It rides in the bed, on a rack, or in the cab, so your skids, spare, and ground clearance stay stock.
Does it need any wiring on a Ranger or Colorado?
No. It runs off the M18™ pack clipped to the horn, so there's no relay, fuse tap, or air line on the truck.
Can I move it between my midsize and a full-size truck?
Yes. Unclip the strap and move it. The full-size fit notes are in the F-150, Silverado, and RAM 1500 guide.
Is a train horn legal on my truck?
That depends on your state. In general, use it for warning and off-highway fun, not to honk at traffic on the street. Check your state's rules before you mount it.
Small truck, big horn, zero holes in the frame. — Cole
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