Conveyor ST: Heavy-Duty Steel Trailer Tire

When you’re hauling big loads, cheap tires don’t cut it.

You need a trailer tire that’s as tough as your schedule, steel-strong, road-proven, and engineered for serious work. Introducing the newly re-engineered Conveyor ST from Rolling Big Power: a premium lineup of 6-ply semi-steel and all-steel 12-ply trailer tires built for long-distance and regional hauling.

Whether you’re pulling a utility trailer, camper, boat or car hauler, the Conveyor ST is ready to roll with unmatched strength and dependability. Rolling Big Power offers best-in-class camper tires, boat trailer tires and steel tires suited for every use-case scenario.

What Is a Trailer Tire?

Trailer tires are designed specifically for towed vehicles, not driven ones.

That means they’re optimized to carry heavy loads in a straight line without the steering and braking demands of a passenger vehicle. They’re built with stiffer sidewalls to handle vertical load and resist sway, and they often use reinforced casings to support more weight over long periods.

Unlike car or truck tires, trailer tires (often labeled “ST” for Special Trailer) are engineered to keep your trailer stable, planted, and safe at highway speeds.

What to Look for in a Trailer Tire

Choosing the right trailer tire isn’t just about picking the right size, it’s about choosing the right construction for the job. Here’s what matters:

  • Load Rating: Make sure the tire is rated to carry the full weight of your trailer when fully loaded.
  • Ply Rating: Higher ply ratings mean stronger sidewalls and greater load-carrying capacity.
  • Steel Construction: Steel-belted or steel-cased tires like the Conveyor ST offer superior durability and heat resistance.
  • Speed Rating: Check that the tire’s rated speed matches how you plan to tow.
  • Tread Design: A smooth, even wear pattern promotes longer life and better tracking on the road.

Don’t just match what came on the trailer, match what your use case demands.

Feature RBP Conveyor ST (Steel) RBP Conveyor ST (Semi-Steel)
Construction Full Steel Belted Steel + Polyester (Semi-Steel)
Load Capacity Higher Standard
Durability Maximum High
Tread Life Longer Long
Ride Comfort Firm Smoother
Best For Heavy-Duty, Commercial Use General, Light to Medium-Duty Use

Built Different: Semi-Steel and All-Steel Options

The Conveyor ST isn’t a one-size-fits-all solution, it’s a purpose-built trailer tire with options to match your exact load and lifestyle.

Semi-Steel Construction: Ideal for everyday hauling with reinforced durability. Available in common sizes from 145R12 to 235/85R16 with load ratings from C to F.

All-Steel Construction: Maximum muscle for your heaviest loads. Sizes include 225/75R15 and 235/85R16, with high-load ratings up to G/12 ply.

Steel belted radial construction delivers superior strength and a stable, even ride. These tires are engineered to resist flexing under pressure, minimizing blowouts and improving tread life. Whether you’re towing coast-to-coast or just crossing state lines, the Conveyor ST makes sure your trailer stays planted and predictable.

Why Steel Tires Matter

Steel cased and steel-belted radial tires like the Conveyor ST offer real-world advantages over standard trailer tires:

  • Stronger sidewalls that handle heavier loads without squirm.
  • Improved heat resistance on long hauls.
  • Enhanced puncture resistance, especially important on work sites or rough terrain.
  • Longer tread life, giving you more miles for your money.

If you’ve ever dealt with a trailer blowout on the side of the highway, you know why steel construction is worth it.

FAQs

At RBP, we offer two construction types in our Conveyor ST line to meet different needs. Our Semi-Steel Conveyor ST tires feature a combination of steel belts with textile materials, providing an excellent balance of durability and value for most trailer applications. They offer robust performance for utility, cargo, and boat trailers under normal load conditions. Our All Steel Conveyor ST tires, on the other hand, feature full steel construction throughout the tire body and belts, delivering maximum strength and load-carrying capacity. This makes them ideal for heavier trailers and extreme load situations. The all-steel construction provides superior puncture resistance and heat dissipation, which is crucial when hauling heavy loads over long distances.

Absolutely! Our RBP Conveyor ST tires are specifically engineered for various trailer applications, including boat trailers. The robust construction of our Conveyor ST line ensures they can handle the unique challenges boat trailers face, including exposure to water, boat ramps, and varying load distributions when trailering watercraft. The ribbed tread pattern and optimized grooves effectively channel water away from the tire footprint, reducing hydroplaning risk – an important feature when launching and retrieving boats. Plus, our all-season compound maintains flexibility whether you're towing your boat in summer heat or cooler temperatures. Many of our customers specifically choose the Conveyor ST for their boat trailers due to their reliable performance in marine environment.

This depends entirely on your camper's weight and your towing needs. Our Conveyor ST line includes options in various load ranges to accommodate different requirements. For lighter campers and travel trailers, our 6-ply rated tires (also known as Load Range C) provide sufficient load capacity while offering a somewhat softer ride. For heavier campers, fifth wheels, or if you frequently travel with your camper fully loaded, we recommend our 12-ply rated tires (Load Range F). These offer substantially higher load capacity and puncture resistance, giving you peace of mind when towing valuable cargo. The 12-ply construction in our Conveyor ST provides excellent stability even with heavy loads, reducing sway and improving overall towing safety.

The lifespan of your RBP Conveyor ST trailer tires depends on several factors, including usage frequency, storage conditions, maintenance, and road conditions. With proper care, our trailer tires are designed to deliver years of reliable service. We recommend replacing trailer tires every 3-5 years, even if tread depth remains adequate. This is because trailer tires, which often sit for extended periods, can experience weathering and ozone cracking over time. Regular inspection for signs of wear, maintaining proper inflation pressure, and protecting tires from UV exposure when stored will maximize their service life.

Yes, the RBP Conveyor ST is designed as an all-season tire that performs reliably year-round. The specialized all-season compound remains flexible in both warm and cold temperatures, while the engineered tread pattern provides excellent traction in dry, wet, and light winter conditions. In wet conditions, the optimized grooves effectively channel water away from the tire's contact patch, reducing hydroplaning risk and maintaining grip. The ribbed tread design creates numerous biting edges that enhance traction even in light snow. However, for frequent or extreme winter driving in heavy snow or ice, we recommend considering specialized winter tires for optimal safety.

Finding the right tire size is crucial for safe towing and optimal performance. The easiest way to determine the correct size is to check the sidewall of your current tires, where you'll find information like ST205/75R15 or ST235/80R16. The "ST" designation stands for "Special Trailer" and indicates these tires are specifically designed for trailer applications rather than passenger vehicles. Our Conveyor ST line is available in a wide range of sizes from 13" to 16" diameter, with various width and aspect ratio combinations to fit virtually any trailer. When selecting your tire size, ensure the load index matches or exceeds your trailer's requirements. If you're upgrading or replacing tires of a different brand, our customer service team can help ensure you select the right RBP Conveyor ST size for your specific trailer. Remember that proper tire sizing affects not only safety but also towing stability, fuel efficiency, and tire longevity, so it's worth taking the time to get it right.

Ready to Roll?

The Conveyor ST isn’t just another trailer tire. It’s a serious upgrade for anyone who takes hauling seriously. Whether you’re looking for a rugged steel case tire, dependable steel belted radial tires, or just want a trailer tire that won’t let you down, this is the one to beat.

Find your fit today at rbptires.com and get ready to haul smarter, longer, and stronger.