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Let’s Get Wheel

Enclosed Trailer Tire Safety

Undoubtedly, most of us have experienced tire problems. Maybe you've saved a stranded commuter from a flat or were on the wrong end of a semi's rubber debris. As a result, you know the costly and potentially dangerous ramifications of tire failure. For the purpose of preventing similar situations, this article will discuss general Special (ST) Tires safety.

They're Special

Special Trailer Tire

To begin with, let's identify the style of tires designated for trailers. Collectively known as Special Trailer (ST) Tires, they are constructed as either bias or radial and are made for trailer axle postions only. Their assembly varies substantially from car tires, therefore it is crucial to choose the correct tire for towing. Whereas, a strong sidewall scheme allows for heavier loads, they have a limit at higher speeds. While some enclosed trailer tires rate up to 81 mph(M), the suggested speed rating is only 65mph. For these reasons, use ST tires on enclosed trailers to avoid...

Failure to Maintain

Contrarily to consumer beliefs, inferior products are not the primary cause of enclosed trailer tire issues. In fact, aside from recalls, the main failures are owner related. With this in mind, here are common causes of tire malfunction.

  • Overloaded Tires
  • Over/Underinflation
  • Improper Weight Distribution
  • Excessive Speeding

Sometimes, however, there are factors we can't control. Highway hazards such as potholes and rogue nails are among the most noted. Plus, those heavier loads eventually leave their impression. Even then, the tread may show little wear. So, it's important to realize oxidation of rubber causes detoriation.That way, a special (ST) tire gets changed before disaster strikes.

Keep 'em Rollin

Special Trailer (TR) Tire Placard

To be sure your enclosed trailer tires keep rolling, follow the directions in your owner's manual. Coupled with those instructions and good sense, accidents become less likely, Also, pay close attention to the information on the trailer's Tire Placard. As can be seen in the image, you will find the trailer's tire size, Gross Vehicle Weight Rating (GVWR), and recommended cold inflation settings. Furthermore, I've included additonal industry standards and tips that will help swurve around flats and blowouts.

  • Sustain the cited maximum PSI's (Pounds per Square Inch)
  • Avoid overloading. Never exceed the GVWR
  • Check air pressure regularly with a suitable gauge
  • Tighten lugnuts after initial 10, 25 and 50 miles, respectively
  • Always use identical (ST) tires
  • When storing, cover complete tire and inflate to max. allowed

Apart from that list, it's a good idea to purchase a Special (ST) Tire spare. The comfort a backup brings is well worth the price. Matt at Southern USA Trailers can plug you in with one for the most competitive prices. Give him a call today at (888) 227-2565 or visit

It's Been Wheel,
Axel Armstrong

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Which Axles, Axel?

Leaf Spring or Torsion Axles?

Commonly, enclosed cargo trailers are built with leaf spring or torsion axles. I have heard the question asked many times, "Are leaf springs or torsion axles better?" To help those pondering the same notion, I've broken down both the pros and cons of the two below.

Leaf Spring   


  • Affordibility
  • Can be Repaired
  • Even Tire Wear on Multi-Axle Configurations


  • Metal on Metal can be Noisy
  • Unsmooth Rides on Uneven/Bumpy Roads
  • Require More Maintenance



  • Straightforward Construction
  • Smooth Ride
  • Independent Wheel Suspension


  • Cannot be Repaired
  • Replacement is Not Cost Effective
  • Increased Tire Wear on Multi-Axle Configurations

Ultimately, choosing between leaf spring and torsion axles comes down to a personal preference. Remember, these are just a few points to consider when choosing which type of axle better suits your needs. For more information on either type, or any enclosed trailer question you may have, contact Matt at Southern USA Trailers.