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The short version: the right trailer tire is the cheapest way to avoid a blowout on the shoulder with a loaded trailer — and the rules here are different from car tires, so read before you buy. Every pick below is ST-rated (Special Trailer), because passenger and LT tires are not built for trailer duty. Our #1 pick is the Carlisle Radial Trail HD: a cooler-running, longer-wearing radial that owners recommend more than any other. The Maxxis M8008 is the premium upgrade for heavy or high-mileage towing. But the "best" tire is the one that matches your size and load range — that is safety-critical, and we explain exactly how to check it below.
New tires are half the job — keep them at the sidewall pressure with a portable inflator and gauge, know how to change a tire on the roadside, and secure the trailer with a proper hitch pin lock. See the full roadside emergency & safety hub for the rest of the towing kit.
Top Picks at a Glance
Our #1 Pick: The Carlisle Radial Trail HD
The Radial Trail HD earns the top spot because it fixes the problem most trailers have straight from the factory: cheap bias-ply tires that run hot and wear out fast. As a radial, it builds less heat at highway speed and lasts noticeably longer, and Carlisle offers it across the common sizes and load ranges so you can match it to your exact trailer. Owners consistently report years of dependable service. Just remember that a great tire is only great in the correct spec — confirm your size and load range before you order, because the same model in the wrong load range is the wrong tire.
Best for the most-recommended all-round ST trailer tire
- ST-rated (Special Trailer), not passenger
- Radial construction, cooler running
- Deep tread for long tread life
- Load Range C — match to your trailer
Why buy it: the ST tire owners recommend more than any other — a durable radial that runs cooler and wears slower than the bias tires most trailers ship with, in the most common utility-trailer size.
Best for the longevity pick for high-mileage towing
- Premium ST radial, low heat build-up
- Reinforced casing for heavy loads
- Excellent tread-life reputation
- Match load range to trailer GVWR
Why buy it: the tire heavy tow owners buy when they are tired of replacing cheap tires — Maxxis M8008 casings are known for surviving years and miles that shred bargain ST tires.
Best for a solid, affordable ST radial for lighter trailers
- ST radial, budget-friendly
- Load Range D (8-ply rated)
- Proven all-season tread
- Confirm size and load range first
Why buy it: the value pick — a dependable Carlisle ST radial that costs less than the HD while still giving you the cooler-running, longer-wearing radial construction bias tires cannot match.
Best for heavy dual-axle, RV and equipment trailers
- Load Range E (10-ply rated)
- High load capacity per tire
- For heavy RV / car-hauler trailers
- Never substitute a lower range
Why buy it: the heavy-hauler — a Load Range E tire rated for the high per-tire weight of loaded RVs and equipment trailers, where a lighter C or D tire would be dangerously overloaded.
Best for boat and larger tandem-axle trailers
- Premium ST radial in 225 width
- Strong wet and dry traction
- Cool-running for long hauls
- Match to trailer load rating
Why buy it: the larger-trailer Maxxis — the same tough M8008 casing in a wider 225 size that boat and tandem-axle owners favor for stability and long-haul durability.
Best for small utility, landscape and pop-up trailers
- 14-inch ST radial, Load Range C
- Right size for lighter trailers
- Deep, long-wearing tread
- Confirm your rim diameter
Why buy it: the small-trailer pick — the Radial Trail HD in a 14-inch size that fits the huge population of utility, landscape and pop-up trailers that came with worn-out bias tires.
Load Range Is Safety-Critical — Match Your GVWR
This is the part you cannot get wrong. A trailer tire has to carry a heavy vertical load while resisting the side-scrub of cornering, and it does that only if it is rated for the weight. Find your trailer’s GVWR on the data plate near the tongue, divide the loaded weight across the tires, and choose a tire whose capacity comfortably exceeds that number. Load range encodes the strength: C is about 6-ply, D is 8-ply, E is 10-ply. Never fit a lower load range than your trailer calls for, and never recommend one across weight classes — a Load Range C tire on a heavy tandem-axle trailer that needs E will overheat and fail. When in doubt, go up a range, not down. Size and load range are printed on the current tire’s sidewall; use them as your baseline.
Why ST Tires, Not Car Tires
It is tempting to fit a cheap set of passenger tires you found on sale, but ST (Special Trailer) tires exist for a reason. They have stiffer sidewalls and a reinforced casing tuned for the load, sway and scrubbing of a trailer axle — forces a passenger (P) or light-truck (LT) tire was never designed to take. Fit car tires and you invite overheating, wandering and blowouts under load. Unless your trailer’s manufacturer specifically spec’d LT tires from the factory, replace with ST tires of the correct size and load range, and never mix ST and passenger tires on the same trailer.
Age Beats Mileage — Replace on Time
Trailer tires almost always age out before they wear out. Because trailers sit parked for weeks or months, the rubber degrades from UV, ozone and heat cycling even with full tread, so plan to replace ST tires every three to six years regardless of miles. Read the DOT date code (the last four digits are the week and year), inspect the sidewalls for cracking, and retire tires that are checking or older than six years no matter how they look on top. Combined with correct pressure and load, timely replacement is what keeps a trailer tire from letting go at 65 mph.
Trailer Tire Sizes: Reading ST205/75R15
Trailer tire sizes look cryptic but decode simply. In ST205/75R15, ST means Special Trailer, 205 is the width in millimeters, 75 is the sidewall aspect ratio, R is radial construction, and 15 is the rim diameter in inches. All four must match your trailer, so read the size off the current trailer tires or the placard before ordering. ST205/75R15 is the single most common size across utility and boat trailers, but campers and RVs run everything from 14-inch to 16-inch, so confirm yours rather than assuming.
Load Capacity, Ply Rating and Weight
Load range translates directly into carrying capacity. A Load Range C tire is roughly 6-ply and carries the least; D is about 8-ply; E is 10-ply and handles the most weight per tire. The higher the ply rating, the greater the load capacity — and heavy dual-axle, RV and equipment trailers need that E-range strength. Add up the capacity of all the tires and make sure it comfortably clears your loaded trailer weight. Getting the ply and capacity right is not about a smoother ride; on a trailer it is the margin that keeps a heavy load from overheating a tire.
Tread Wear and Recommended Brands
Radial ST tires wear far slower than the bias tires most trailers ship with, and a few brands stand out. The Goodyear Endurance is one of the most recommended ST tires going — a Goodyear Endurance made in the USA that RV and camper owners rate for long tread life and few failures. The endurance trailer tire reputation shows up across GoRVing forums and long cross-country haulers. Reasonably priced against its longevity, it has been a go-to brand for years, and newer sizes keep coming. Between it, Carlisle and Maxxis, most trailers have a well-proven, long-wearing option.
How We Rank
A trailer tire earns trust by surviving heat, load and years of parked degradation, so we rank by aggregated owner ratings, review volume and the durability themes owners repeat rather than a single test tow. We weigh four things. Durability — whether owners get years of service without sidewall cracking or early failure. Heat resistance — the radial construction and casing quality that keep the tire cool at highway speed. Load capability — availability in the load ranges real trailers need, from utility C to heavy-hauler E. And value — cost against the miles and years owners actually get. We only rank ST-rated tires, and we state load range plainly because matching it to your trailer is the whole game. Prices were current at the time of writing.
Quick Comparison
Carlisle Radial Trail HD ST205/75R15 (Load Range C)
Best for the most-recommended all-round ST trailer tire
Best Premium
Maxxis M8008 ST Radial ST205/75R15
Check Price on Amazon
Best Value
Carlisle Radial Trail RH ST205/75R15 (Load Range D)
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Best for Heavy Loads
Carlisle Radial Trail HD ST235/85R16 (Load Range E)
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Best for Larger Trailers
Maxxis M8008 ST Radial ST225/75R15
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Best for Small & Utility Trailers
Carlisle Radial Trail HD ST215/75R14 (Load Range C)
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The Verdict
For most trailers, the Carlisle Radial Trail HD in your correct size and load range is the ST tire owners recommend above the rest — cooler-running and longer-wearing than the bias tires most trailers ship with. Tow heavy or high mileage? Step up to the Maxxis M8008. Whatever you choose, it must be ST-rated and it must match your trailer’s load requirement — that is the rule that keeps you off the shoulder. Check Price on Amazon →