Key takeaways
- Utility trailers: Choose a durable ST radial with a moderate tread pattern, such as the Carlisle Radial Trail HD, in the exact size and load range specified by the trailer manufacturer.
- Boat trailers: Look for corrosion-resistant construction, strong sidewalls, and a tread that evacuates water effectively. The Kenda Karrier and Maxxis M8008 ST Radial are established options to compare.
- Travel trailers: Prioritize heat resistance, a generous load margin, and a speed rating of at least 75 mph when available. The Goodyear Endurance and Carlisle Radial Trail HD are commonly considered for this use.
- Frequent or long-distance towing: Spend more on a premium ST radial rather than using passenger-car tires or heavily aged takeoffs.
The best trailer tires are properly sized ST (Special Trailer) radials with enough load capacity for your trailer’s actual axle weight, a suitable speed rating, and construction designed to control heat under sustained towing.
Our top picks
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Quick picks by trailer type
- Utility trailers: Choose a durable ST radial with a moderate tread pattern, such as the Carlisle Radial Trail HD, in the exact size and load range specified by the trailer manufacturer.
- Boat trailers: Look for corrosion-resistant construction, strong sidewalls, and a tread that evacuates water effectively. The Kenda Karrier and Maxxis M8008 ST Radial are established options to compare.
- Travel trailers: Prioritize heat resistance, a generous load margin, and a speed rating of at least 75 mph when available. The Goodyear Endurance and Carlisle Radial Trail HD are commonly considered for this use.
- Frequent or long-distance towing: Spend more on a premium ST radial rather than using passenger-car tires or heavily aged takeoffs.
What to check before buying
1. Load range and ply rating
Load range is the modern letter-based rating that indicates how much load a tire can carry at its specified inflation pressure. Common trailer ratings run from Load Range C through F. Ply rating is an older strength designation: Load Range C is commonly described as 6-ply-rated, D as 8-ply-rated, and E as 10-ply-rated.
That does not mean a Load Range E tire literally contains 10 layers of casing material. It describes strength equivalent to an older 10-ply construction. Always use the tire’s actual load capacity and maximum cold inflation pressure rather than choosing by the ply number alone.
| Common size | Typical load range | Approximate capacity per tire | Typical maximum pressure | Common use |
|---|---|---|---|---|
| ST205/75R15 | C | About 1,820 lb | 50 psi | Light utility or small boat trailer |
| ST205/75R15 | D | About 2,150 lb | 65 psi | Medium utility or compact travel trailer |
| ST225/75R15 | D | About 2,540 lb | 65 psi | Boat or travel trailer |
| ST235/80R16 | E | About 3,520 lb | 80 psi | Heavier travel or equipment trailer |
These figures are representative, not universal. Capacity varies by tire design and manufacturer, so confirm the sidewall marking and the manufacturer’s load table. Never inflate beyond the wheel’s rated pressure, even when the tire permits a higher maximum.
2. Size and clearance
Match the trailer manufacturer’s original tire size unless a qualified tire professional confirms that a change is safe. A larger tire may rub the fender, suspension, or frame. It can also require a wider wheel, change the trailer’s effective gearing, and reduce clearance when the suspension compresses.
For tandem-axle trailers, check the gap between tires as well as the space above each tire. A useful inspection is to measure with the trailer loaded: there should be adequate sidewall and tread clearance through suspension movement, not merely while the trailer is parked empty.
3. Speed rating
Trailer tires often carry speed symbols such as L, indicating 75 mph, or M, indicating 81 mph. Some are limited to 65 mph. The speed rating is not a recommendation to tow at that speed; it is a limit under specified conditions. Follow the lower limit shown in the tire documentation, trailer instructions, and local law.
At highway speed, heat accumulates quickly from underinflation, overloading, high ambient temperatures, and repeated braking. A tire with a higher speed rating can provide additional margin, but it cannot compensate for insufficient load capacity or low pressure.
How tread design affects trailer performance
Trailer tires use more than tread depth to manage towing forces. Their internal construction is designed to resist lateral scrub, which occurs when a tandem trailer turns and the tires slide slightly across the pavement rather than rolling in a perfect arc.
- Continuous center ribs: Help directional stability and reduce wandering on highways.
- Shoulder blocks: Help resist the sidewall flex and shoulder wear caused by tight turns.
- Wide circumferential grooves: Move water away from the contact patch and are useful for wet roads and boat-ramp approaches.
- Open grooves: Can improve loose-surface traction on utility trailers, but may produce more noise and wear faster on pavement.
- Deep tread: Adds wet-weather life, but a strong casing and heat-resistant compound matter more than tread depth alone for heavily loaded highway travel.
A boat trailer does not need an aggressive off-road tread simply because it visits a ramp. A balanced rib-and-groove pattern is usually more useful for paved roads, standing water, and repeated tight maneuvers.
Heat resistance and construction
Heat is one of the main causes of trailer-tire failure. ST tires are built with reinforced sidewalls and casings, but they still generate excessive heat when operated below their required pressure. Radial construction generally runs cooler and tracks better than bias-ply construction during regular highway travel.
For long-distance travel trailers, favor a tire with a documented highway-oriented design, strong belt package, and a load capacity comfortably above the measured tire load. Examples worth comparing include the Goodyear Endurance, Maxxis M8008 ST Radial, and Carlisle Radial Trail HD. Availability and exact specifications vary by size, so compare the specification sheet for the specific tire rather than relying only on the model name.
For an occasional low-speed utility trailer, a bias-ply tire may be adequate if it matches the axle and wheel requirements. Radial tires are usually the better choice when the trailer regularly travels at highway speeds or remains loaded for long periods.
A practical sizing calculation
Suppose a tandem-axle travel trailer weighs 7,200 lb when loaded. Dividing by four tires gives 1,800 lb per tire, but that is only an estimate. Uneven loading can put significantly more weight on one side, so a reasonable selection should provide a margin rather than matching 1,800 lb exactly.
If the trailer manufacturer specifies ST225/75R15 Load Range D tires rated around 2,540 lb each, the nominal total tire capacity is 10,160 lb. That provides approximately 2,960 lb of capacity above the stated loaded weight. The axle, wheels, and trailer’s gross vehicle weight rating still limit the combination; extra tire capacity does not increase the trailer’s legal or structural carrying capacity.
For the most accurate result, weigh each axle and, where possible, each wheel position at a certified scale. Inflate the tires to the pressure required for the measured load, while observing the trailer maker’s instructions and the tire manufacturer’s load-inflation table.
Decision matrix for choosing the best trailer tires
| Your situation | Best tire approach | What to prioritize |
|---|---|---|
| Occasional light utility use | Value-oriented ST radial in the specified size | Correct load range, weather-fresh inventory, basic durability |
| Weekly landscaping or equipment hauling | Heavy-duty ST radial with a load margin | Sidewall strength, puncture resistance, shoulder durability |
| Frequent boat launching | ST radial with water-shedding tread and corrosion-conscious wheel fitment | Wet traction, stable handling, rinsing after saltwater exposure |
| Long travel-trailer trips | Premium highway-oriented ST radial | Heat resistance, higher speed rating, load reserve, age control |
| Trailer stored outdoors | UV-resistant, properly covered tire from fresh stock | Sidewall condition, manufacturing date, protection from sun and ozone |
Ownership details that prevent early failure
Check pressure before every trip, when the tires are cold. Do not bleed air from a warm tire to reach the cold-pressure number. Inspect for cracking between tread blocks, bulges, uneven wear, exposed cords, valve-stem leaks, and damage from curbs or debris.
Uneven wear often identifies a mechanical problem rather than a bad tire. Wear on one edge can indicate axle misalignment, bent suspension parts, or incorrect camber. Center wear commonly suggests overinflation, while wear on both shoulders can indicate underinflation or excessive loading.
Replace tires based on condition and age, not tread depth alone. Trailer tires can deteriorate while parked, especially in sunlight or near electric motors that generate ozone. Many owners replace them around five to seven years from the manufacturing date as a precaution, although the correct interval depends on storage, climate, inspections, and the tire maker’s guidance.
After launching a boat in salt water, rinse the tires and wheels with fresh water and allow them to dry. Use a cover that blocks ultraviolet light but does not trap moisture. Avoid petroleum-based tire dressings, which can damage some rubber compounds.
Final buying checklist
- Confirm the exact size printed on the trailer, tire, or manufacturer plate.
- Calculate real loaded weight and leave a sensible capacity margin.
- Match the wheel’s diameter, width, bolt pattern, and pressure rating.
- Choose ST radial construction for regular highway towing.
- Verify the speed symbol and never exceed the lowest applicable limit.
- Buy tires with recent manufacturing dates and inspect them before fitting.
- Set cold pressure according to the load-inflation table and trailer guidance.
The best trailer tires are not necessarily the ones with the deepest tread or highest load letter. They are the tires whose size, capacity, pressure, construction, and speed rating match the trailer and the way it is actually used.
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