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Horse Trailer Safety: Never Buy a Trailer with These Dangerous Features

Last updated November 29, 2023 by Rachael Kraft

I’ll never forget the day that I saw a horse flip backwards inside a horse trailer.  It was terrifying.  I remember a feeling of helplessness and worry as the panicked mare desperately tried to free herself from the trailer’s metal interior.  This was the day that I learned very quickly how important it was to have the right horse trailer safety features.

horse trailer accidentThe day of the accident started like many summer days during show season.  We had loaded up two Arabians and a Quarter Horse onto our friend’s straight load 3 horse trailer.  It was a typical morning with a familiar drive to the local fairgrounds where we planned to attend a county 4-H show.  Suddenly, on a back country road, everything changed.

I was following the trailer in my family’s vehicle when we spotted a horse hoof emerge from the side rear window of the trailer.  Realizing the danger of the situation, we floored the gas pedal, blared the horn, and signaled to our friends to pull over.

Everyone rushed to the rear of the trailer to lower the back ramp and received a startling sight.  Instead of the expected three horse rumps standing side-by-side, we saw a horse’s head lull out onto the ramp. The left positioned Arabian mare had completely flipped over and was laying on her back in the cramped trailer stall.

There was blood everywhere.  She was not moving.

The gelding beside the stricken mare shifted his feet nervously and stepped on the top portion of the downed mare’s back jolting her into motion.  She began to frantically scramble her hooves trying to extricate herself from the metal cell.

butt barsInterior dividers and the butt bar impeded her movement as she struggled to stand and escape.  Meanwhile, the other two horses danced around nervously beside her.  We were all helpless as we watched the mare lurch to her feet and saw the safety release dividers give way all around her.

Once the terrified mare was free of the trailer, we discovered to our great relief that the majority of the blood was coming from one deep cut on her lip.  Otherwise, she was mostly unharmed.

This incident will forever be burned in my memory as an example of a trailer ride gone wrong.  Now, I understand that much worse could have happened.  I’ve read of horses falling through the floors of moving trailers, kicking delicate legs through thin metal walls, and getting trapped inside twisted highway wreckage.

Incidents like these highlight the importance of choosing a trailer that has the right type of safety features to protect horses on the road.  Along with Double D Trailers owner, Brad Heath, I have compiled this list of horse trailer safety hazards that you should avoid at all cost.  These are the types of horse trailer design flaws that can lead to very serious accidents.

Horse Trailer Design Flaws: Partitions and Interior

Butt and Chest BarsBe on the lookout for poorly design butt and chest bars.  A horse could get trapped underneath a butt bar and cause serious injury in the scramble to stand back up.  Alternatively, they can get a leg over top of a chest bar so that it’s nearly impossible to release with their weight on top.  Make sure you look for butt and chest bars that have a removable pit that can release even with the full weight of the horse on the bar.

Weak Interior DividersAs with butt and chest bars, it is important that interior dividers can withstand some serious force from a panicked horse or during an accident.  Stay away from aluminum interior dividers because the weak metal tends to break at the welding points resulting in sharp jagged edges.  Instead, look for a much stronger option.  Steel is strong but can rust, so your best bet is a composite material like Z-Frame technology to provide long-lasting durability.

solid head dividersSolid Head DividersHorses are naturally claustrophobic animals so the best way to avoid panic attacks are to minimize stress and keep your animal comfortable.  Solid head dividers (see picture to the right) not only prevent the movement of air and the flow of light, but make a horse feel like they are trapped in a coffin.  Instead, opt for tubular head dividers so they can see their travel mates and benefit from more air circulation.

Noisy InteriorsAnother way to minimize stress for your horse is to rid the trailer of all rattles and creaking during travel.  Any trailer that uses bolts, screws, or mechanical fasteners will have a metal on metal scraping noise while the trailer is in motion.  Instead, look for trailers that use a 3M chemical bonding system (also known as “tape”) for a quieter ride and secure seal.

windows paddingSmall WindowsGood air circulation is important so that horses can stay cool in the summer and avoid breathing in dust and particulate matter that would irritate their airways.  Avoid small windows on your trailer.  Look for large windows that can be opened with latches positioned within a reachable height.

Too Little Interior Padding – If you encounter a trailer with little or no interior padding, you should walk away immediately.  Look for padding that is at least 1” thick on all dividers and walls.  Better yet, go with 2” padding from Double D Trailers.

Walls, Floor, and Roofing Hazards

weak aluminum flooringThin Aluminum WallsWe were lucky with our friend’s mare.  In her panic, she could have kicked hard against the side of the trailer.  Some trailers have only a thin layer of aluminum sheet metal on the exterior walls that can be punctured by a good strong kick.  Brad Heath explained, “These single walled trailers with aluminum skin can be very dangerous for horses.”  Instead, look for double layered insulated walls with a stronger material like 16-gauge Galvanite.

Aluminum FlooringAluminum isn’t any better to use on the floor of a trailer.  Over time it can actually rust and weaken (see picture to the right).  The last thing you want is for your horse to drop a leg through a hole in a horse trailer floor.  In addition, aluminum flooring transfers a great deal of heat and vibration up from the road and can cause excessive fatigue on your horse’s legs.  Instead, look for wood or synthetic Rumber flooring for strength and minimal heat and vibration transfer.

mill finished roofMill-Finished Aluminum RoofsYou may be seeing a trend here.  Single-sheet aluminum is also a lousy material to use on roofs (see picture to the right).  In fact, Brad declared, “It’s the poorest design and worst choice of material on the planet to cover a horse trailer!”  Aluminum conducts heat directly into the trailer increasing the interior temperature to dangerous levels on hot, sunny days.  Look instead for a roof with two-layers of roofing metal separated by a layer of insulation.  The surface should be painted white to reflect away light and heat.  The best option is a SafeBump roof from Double D Trailers because it is a fiber composite material that cannot leak, is insulated, and is flexible in case your horse strikes his head.

Weak Rubber Wall LiningsMost trailer manufacturers only use a rubber lining on the walls that is 3/16” thick.  Pawing horses can pull this away from the wall exposing sharp metal fasteners.  Instead, look for wall linings that are at least 30” from the flooring and made of a petroleum product that is at least 1/2” thick.  SafeKick walls from Double D Trailers are a great option because they are thick, well secured, and designed to protect your horse from injury.

Loading and Unloading Dangers

slant load horse trailerStationary Rear Tack Areas in Slant Load Horse TrailersThis final dangerous design feature is extremely common within the trailer industry.  Avoid slant load trailers that have a stationary tack storage area at the rear of the trailer (see photo to the right).  This tack area makes good use of otherwise wasted space, but it also leaves the horse and loader with a very narrow doorway for entering the trailer.

This narrow opening is scary for many horses who see it as a dark hole with no route for escape.  Even if you’ve trained your horse to tolerate this type of trailer, he may still be experiencing elevated levels of the stress hormone cortisol.  Stressed horses are more susceptible to infections like shipping fever.  In addition, in an emergency situation, you will have limited access to your horse with this type of trailer configuration.  A panicked horse trying to rush through this narrow escape door could easily run over a handler.

Instead, look for a trailer with multiple escape doors on the front and side of the trailer.  Better yet, look into models like the Double D Trailers SafeTack design where the rear tack storage area can be swung out like a second door.  This will eliminate the problem of a narrow door and limited access.

Each horse person is going to have their own personal experiences that help mold the type of safety practices they use on a daily basis.  It is our job to learn from these experiences to make the best decisions for the health and well-being of our horses and family members.  Hopefully this list of dangerous trailer features will provide some guidance for the next time you go to purchase a new trailer.

Questions:  What experiences have you had that highlight the need for proper horse trailer safety features?

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