Key takeaways
- Set cold pressure before every trip, using the pressure printed on the tire or specified by the trailer maker—not the pressure listed for a different tire.
- Inspect for cuts, bulges, embedded objects, uneven wear, and cracking.
- Check wheel torque after wheel installation and again after the first short drive.
- Balance replacement assemblies and repair alignment or suspension problems that cause cupping.
- Use metal valve stems where the pressure and wheel manufacturer require them.
- Keep tires covered or stored away from sunlight, electric motors, solvents, and petroleum products.
- Do not overload the trailer or tow with a tire that is losing pressure.
The best trailer tires for most owners are radial ST tires chosen by actual axle load, with at least a modest capacity reserve, a suitable speed rating, and a recent DOT date code—not simply the tire with the highest ply number.
Our top picks
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Best trailer tires by use case
| Trailer situation | Recommended tire type | Useful specification target | Why it fits |
|---|---|---|---|
| Light utility trailer, occasional use | ST radial, Load Range C or D | 1,750–2,150 lb per tire; 65 mph or higher | Good value, stable highway behavior, and enough capacity for many single-axle trailers |
| Boat or enclosed trailer used regularly | Premium ST radial, Load Range D or E | 2,150–2,830 lb per tire; 75 mph or higher | Better heat management and tread durability during longer trips |
| Heavy tandem-axle equipment trailer | ST radial, Load Range E or G where approved | 3,500–4,400 lb per tire; 75–87 mph | Provides greater reserve capacity without exceeding wheel or axle limits |
| Frequent towing in hot weather | Premium radial with reinforced casing and heat-resistant compound | Correct load range, 75 mph or higher, full inflation | Reduces heat buildup, a major cause of trailer-tire failures |
| Rarely used trailer stored outdoors | UV-resistant ST radial with a recent date code | Replace based on condition and age, not tread depth alone | Sun exposure, ozone, and underinflation can age the casing before it looks worn out |
Among established choices, the Goodyear Endurance, Carlisle Radial Trail HD, and Maxxis M8008 ST are commonly considered premium ST radial options. Kenda Karrier lines are widely available in many trailer sizes and can be sensible value choices. Exact availability, load range, and speed rating vary by size, so the sidewall and current manufacturer specification should decide the purchase.
Load range matters more than ply wording
Modern trailer tires use “Load Range” rather than the old practice of describing a tire by its ply count. Load Range C, D, E, and G generally correspond to maximum inflation pressures of 50, 65, 80, and 110 psi respectively, although the tire’s sidewall is the final authority. A Load Range E tire is not literally made from ten fabric plies; the designation describes its pressure and carrying category.
Never choose capacity by adding the trailer’s gross vehicle weight rating to the tow vehicle’s payload. Use the trailer’s actual loaded weight, including cargo, batteries, propane, spare tires, and water. Then divide the load between the tires. A tandem-axle trailer with 7,000 pounds on its axles carries approximately 1,750 pounds per tire. A tire rated for 2,150 pounds gives a nominal 400-pound reserve per tire, provided the wheel, axle, and inflation specification also support it.
That reserve is useful, but more capacity is not automatically better. A very stiff, high-pressure tire on an underrated wheel can create an unsafe mismatch and may produce a harsh ride that transfers more shock into the trailer. The tire, wheel, axle, and trailer manufacturer ratings must work together.
Common sizes and realistic capacity differences
The following figures are representative examples for common ST radial sizes. Ratings can differ by brand and construction, so confirm the exact sidewall marking before buying.
| Common ST size | Typical load range | Approximate maximum load per tire | Typical maximum pressure | Common speed rating |
|---|---|---|---|---|
| ST205/75R15 | D | 1,820 lb | 65 psi | L, 75 mph |
| ST205/75R15 | E | 2,150 lb | 80 psi | L or higher, depending on model |
| ST225/75R15 | D | 2,540 lb | 65 psi | L, 75 mph |
| ST225/75R15 | E | 2,830 lb | 80 psi | L or higher, depending on model |
| ST235/80R16 | E | About 3,520 lb | 80 psi | L or higher, depending on model |
| ST235/85R16 | E | About 3,640 lb | 80 psi | L or higher, depending on model |
For example, a tandem-axle trailer carrying 6,800 pounds on its axles needs about 1,700 pounds per tire. Four ST205/75R15 Load Range D tires rated at 1,820 pounds provide 7,280 pounds of combined tire capacity. Four Load Range E tires provide 8,600 pounds, but only use that upgrade if the wheels and trailer are approved for the higher pressure.
Radial construction, tread, and heat resistance
Radial ST tires usually run cooler and track more smoothly at highway speed than comparable bias-ply tires. Their steel-belted construction helps control tread growth and casing flex, while polyester body plies and reinforced sidewalls support trailer loads. Bias-ply tires remain useful for some agricultural, off-road, and low-speed applications, but radial tires are usually the better choice for long highway trips.
Look for a tread designed for trailer duty rather than a passenger-car pattern. Trailer tires must resist irregular wear caused by axle scrub, backing, tight turns, and limited suspension movement. A continuous center rib can improve straight-line tracking; shoulder grooves help evacuate water; and a thicker tread or reinforced belt package can improve durability. These features do not compensate for low pressure. Underinflation creates sidewall flex and heat faster than most tread designs can overcome.
Heat is especially important on enclosed trailers, heavily loaded boat trailers, and vehicles traveling long distances in summer. A tire with a higher speed rating may have a casing and compound better suited to sustained highway use, but its rating assumes correct inflation, proper loading, and acceptable ambient conditions. Speed rating is not permission to exceed the trailer manufacturer’s limit.
How to select the right tire in five steps
- Find the trailer’s loaded axle weight. Weigh the trailer as it is actually used, preferably at a certified scale. Do not rely only on an empty-tongue estimate.
- Divide by the number of tires. Compare that figure with the tire’s capacity at its stated maximum pressure. Include a reasonable reserve rather than operating at the limit.
- Match the original size and wheel. Confirm diameter, width, bolt clearance, fender clearance, load range, and the wheel’s maximum psi. A wider or taller tire can rub during suspension travel.
- Choose the speed rating. L indicates 75 mph, M 81 mph, and N 87 mph in the common ST rating system. Follow the trailer and tire maker’s lower limit.
- Check the date code and condition. Inspect all tires, including a rarely used spare, before installation.
DOT date codes and the ownership reality
The final four digits of a DOT tire identification code show the production week and year. For example, “3525” means the tire was manufactured in the 35th week of 2025. Tires stored in heat or direct sunlight can age even when tread wear is minimal. Cracking between tread blocks, sidewall weather checking, bulges, exposed cords, vibration, or repeated pressure loss are reasons to remove a tire from service.
Many tire and trailer manufacturers recommend replacement around six years from manufacture, while some owners replace earlier when exposure is severe. There is no universal age rule that overrides the manufacturer’s guidance. When buying in 2026, ask for the date code and avoid treating a discounted, old stock tire as a bargain if much of its service life has already passed.
Maintenance that prevents premature failure
- Set cold pressure before every trip, using the pressure printed on the tire or specified by the trailer maker—not the pressure listed for a different tire.
- Inspect for cuts, bulges, embedded objects, uneven wear, and cracking.
- Check wheel torque after wheel installation and again after the first short drive.
- Balance replacement assemblies and repair alignment or suspension problems that cause cupping.
- Use metal valve stems where the pressure and wheel manufacturer require them.
- Keep tires covered or stored away from sunlight, electric motors, solvents, and petroleum products.
- Do not overload the trailer or tow with a tire that is losing pressure.
For the best balance of load capacity and long-term reliability, start with the trailer’s measured axle load, select a properly fitting ST radial with a reserve, and prioritize a recent date code and heat-resistant construction. A premium tire can last well, but correct inflation, protected storage, and matching the wheel and axle ratings determine whether that capability is realized.
