Which Trailer Tire Survives Heat, Sun and Storage?
Goodyear’s Endurance ST Radial leads this list, thanks to a higher speed rating and construction built for sustained highway use. Regular towing is better served by the Carlisle Radial Trail HD, priced well for a full set. Heavier trailers need the Maxxis M8008 ST Radial, which resists heat under sustained load.
Most towing calls for the Goodyear Endurance ST Radial, which carries a higher speed rating and holds up on hot pavement. Regular seasonal use fits the Carlisle Radial Trail HD, priced well across a full set. Heavier trailers do better on the Maxxis M8008 ST Radial.
Trailer tires rarely wear out. Heat, sun and time crack the sidewall long before the tread does, and a tire with plenty left can still be unsafe. We compared load range, speed rating, radial versus bias construction and ply count, then weighed owner reports on blowouts, cracking and how well each tire holds air through a winter in storage.
What matters most
What makes an ST tire different from a car tire? Special Trailer tires carry an ST prefix and stiffer sidewalls built to support vertical load and resist sway, not to steer or brake. Passenger car tires flex too much under trailer weight, generate heat and can fail. Some owners fit light truck tires to heavy trailers, but that needs careful load math. For nearly every trailer, ST tires in the size printed on the axle placard are the right call.
How does load range relate to tire pressure? Load range letters set a maximum load at a specified cold inflation pressure, and that rating only holds when the tire sits at that pressure. Underinflation is the leading cause of trailer tire failure, since a soft tire flexes, heats up and separates. Check pressure cold before every trip; trailer tires lose air sitting idle, and a glance will not reveal a tire well below spec.
Why do trailer tires age out before they wear out? Most trailer tires get replaced with plenty of tread left, because the rubber ages out. Sun, ozone and heat cycles break down the sidewall from the inside, producing fine cracks ahead of a blowout. A four digit date code on the sidewall gives the week and year of manufacture. Plan replacement around three to five years, regardless of tread depth or appearance.
Which speed rating handles sustained highway towing? Many standard trailer tires carry lower speed ratings than modern highway traffic flow, which is why fast, sustained towing on hot pavement causes failures. A higher speed rated tire buys real margin. Keep loads within the axle rating, avoid overloading one side, and stop periodically to feel for a hub or tire running hotter than the others.
The top picks, ranked
Goodyear Endurance ST Radial
Owners who once suffered a roadside blowout often switch to the Endurance next. Its speed rating tops typical ST tires, and the casing is built for sustained highway running. Fewer blowouts and longer sidewall life show up again and again in owner reports.
Pros
- Strong reputation for reliability
- Higher speed rating than typical ST tires
- Good sidewall durability in sun and heat
Cons
- Costs more than budget ST tires
- Popular sizes often sell out
Carlisle Radial Trail HD
Carlisle built the Radial Trail HD as the mainstream option, with solid load ratings and a tread designed to run cool. Boat, utility and travel trailers used most weekends suit it well. Replacing a full set of four or six keeps the cost sensible.
Pros
- Good value across a full set
- Tread runs cool on long hauls
- Widely stocked in common sizes
Cons
- Lower speed rating than premium tires
- Sidewalls still need sun protection
Maxxis M8008 ST Radial
Maxxis gives the M8008 a robust casing that manages sustained load without excessive heat buildup. Owners upgrading from marginal factory tires on heavy travel trailers reach for this one. Its tread tracks straight and resists the scrubbing tandem axles cause in tight turns.
Pros
- Handles heavy loads without excess heat
- Tracks straight at highway speed
- Resists scrubbing on tandem axles
Cons
- Firmer ride on lightly loaded trailers
- Smaller sizes are limited
Trailer King ST Radial II
Trailer King covers the essentials at a lower outlay, with radial construction and reasonable load ratings. Utility and boat trailers seeing local use rather than cross country miles fit it best. Based on specifications, it favors value over top speed ratings.
Pros
- Low cost per tire
- Radial construction at a budget price
- Fine for local, occasional hauls
Cons
- Lower speed rating than premium radials
- Shorter expected service life
Kenda Loadstar Karrier ST Radial
Boat trailer manufacturers fit Kenda’s Loadstar Karrier as original equipment for a reason: the compound copes with repeated ramp dunking and sun exposure. Sizes cover the smaller wheel diameters common on boat trailers. Swapping one in keeps the trailer at its designed ride height.
Pros
- Good availability in small sizes
- Suited to marine, wet launch use
- Matches original equipment fitment
Cons
- Not built for heavy highway miles
- Modest load ranges
Freestar M-108 ST Radial
Freestar sits at the budget end, a common pick for a mounted spare that might sit unused for years. Load ratings suit light and medium trailers adequately. Getting a limping trailer to the next town is the job, and it does that without tying up much money.
Pros
- Inexpensive for a spare tire
- Common sizes are easy to find
- Adequate ratings for light duty
Cons
- Not built for long primary use
- Limited heavy load options
Carlisle Sport Trail LH Bias Trailer Tire
Bias ply construction still earns its place on short haul, heavily loaded utility trailers, where stiff sidewalls resist rollover in tight turns. The Sport Trail LH has run in that category for years. Highway miles favor radials instead, since they run cooler and last longer.
Pros
- Stiff sidewalls for tight manoeuvres
- Well suited to short local hauls
- Long running, proven design
Cons
- Runs hotter than radials at speed
- Shorter life on highway miles
Compared at a glance
| # | Model | Type | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Goodyear Endurance ST Radial | ST radial | Best overall | 9.4 | Check price |
| 2 | Carlisle Radial Trail HD | ST radial | Best value | 9.2 | Check price |
| 3 | Maxxis M8008 ST Radial | ST radial | Best for heavy loads | 9.0 | Check price |
| 4 | Trailer King ST Radial II | ST radial | Best budget radial | 8.7 | Check price |
| 5 | Kenda Loadstar Karrier ST Radial | ST radial | Best for boat trailers | 8.5 | Check price |
| 6 | Freestar M-108 ST Radial | ST radial | Best for spares | 8.3 | Check price |
| 7 | Carlisle Sport Trail LH Bias Trailer Tire | Bias ply | Best bias ply option | 8.0 | Check price |
Common questions
How long do trailer tires last?
Typically three to five years regardless of mileage, since they age out before the tread wears down. Check the date code on the sidewall rather than judging by appearance.
What does ST mean on a trailer tire?
ST stands for Special Trailer, a category built with stiffer sidewalls for vertical load and sway resistance rather than steering or braking.
Can I put car tires on my trailer?
It is not recommended. Passenger tires have more flexible sidewalls that generate heat under trailer loads and increase sway.
What pressure should trailer tires run at?
Inflate cold to the pressure listed on the tire sidewall for its maximum load, unless the trailer maker specifies otherwise. Underinflation causes most failures.
Radial or bias ply, which is better for towing?
Radials run cooler and last longer for highway miles, which covers most towing. Bias ply still suits short haul utility trailers where sidewall stiffness matters more than distance.
How do I read the date code on a tire?
Look for a four digit number at the end of the DOT code. The first two digits are the week and the last two are the year of manufacture.
Should I replace all trailer tires at once?
Yes where possible, so every tire shares the same age and construction. Mixing new and aged tires puts uneven load on the newer ones.
How should I store a trailer to protect the tires?
Keep it out of direct sunlight with covers if possible, inflate to the recommended pressure, and move it occasionally to avoid flat spots. Storing on blocks removes load from the tires.
Do I need a spare for my trailer?
Yes. Trailer tires fail suddenly rather than gradually, and roadside help for trailer sizes can be slow. A mounted spare on a matching rim is worth carrying.
Our take
Real highway miles justify the extra outlay for the Goodyear Endurance ST Radial, thanks to its higher speed rating and reputation for surviving hot pavement. Regular seasonal towing suits the Carlisle Radial Trail HD better, and the Maxxis M8008 ST Radial is the one to fit once a trailer runs consistently near its load limit.
Tony Russo
Tony trained as an automotive technician and spent years in service and parts retail before moving into writing. He focuses on garage tools, car care products and accessories from a hands-on maintenance perspective.
