If you tow a travel trailer, fifth wheel, or camper, the 225/75R15 is among the most common Special Trailer (ST) sizes on the road, and picking the right one matters more than most owners realize. Trailer tires live a hard life. They carry heavy static loads for months, then bake on hot asphalt at highway speed, and a single blowout can shred a fender, tear out wiring, and strand you on the shoulder. The right ST tire in this size resists heat, holds its load rating, and tracks straight behind your tow vehicle.
We looked at load range C, D, and E options in 225/75R15, comparing maximum load ratings, speed ratings, ply construction, tread compounds, and real owner reports on tread wear and sidewall durability. Below are our seven top picks, ranked best first, with honest notes on where each one falls short so you can match the tire to your trailer weight and towing habits.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Carlisle Radial Trail HD ST225/75R15 Load Range D Best Overall Load Range D, 8-ply rated, 2540 lb max load, 81 mph speed rating, radial construction |
9.5 | 🛒 Check Price |
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Maxxis M8008 ST Radial ST225/75R15 Load Range E Best for Heavy Loads Load Range E, 10-ply rated, 2830 lb max load, double steel belts plus nylon overlay |
9.3 | 🛒 Check Price |
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Goodyear Endurance ST225/75R15 Load Range D Best Premium Pick Load Range D, 8-ply rated, 2540 lb max load, made in USA, Durawall sidewall technology |
9.1 | 🛒 Check Price |
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Trailer King ST Radial II ST225/75R15 Load Range D Best Value Load Range D, 8-ply rated, 2540 lb max load, 81 mph speed rating, full nylon overlay |
8.8 | 🛒 Check Price |
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Freestar M-108+ ST225/75R15 Load Range E Best High-Capacity Value Load Range E, 10-ply rated, 2830 lb max load, twin steel belts with nylon overlay |
8.5 | 🛒 Check Price |
 |
Transeagle ST Radial II ST225/75R15 Load Range E Toughest Sidewall Load Range E, 10-ply rated, 2830 lb max load, scuff-guard sidewall, premium heat-resistant compound |
8.3 | 🛒 Check Price |
 |
Wanda Journey ST225/75R15 Load Range D Best Budget Set Load Range D, 8-ply rated, 2540 lb max load, steel-belted radial, 81 mph speed rating |
8.0 | 🛒 Check Price |
1. Carlisle Radial Trail HD ST225/75R15 Load Range D: Best Overall
The Carlisle Radial Trail HD has become the default recommendation for 225/75R15 trailer owners, and it earns that spot. The nylon cap ply over the steel belts is the feature that matters most here, because heat is what kills trailer tires, and this construction keeps the tread bonded to the casing on long, hot interstate hauls. Owners towing tandem-axle travel trailers consistently report even wear across the tread and a casing that holds up for years rather than aging out and cracking early. The Load Range D rating gives you a 2540 pound per tire capacity, which covers the vast majority of dual-axle trailers in this size with comfortable headroom.
The honest weakness is that this tire is built for serious load, so if you are towing a small single-axle pop-up that weighs well under its rating, the stiffer D-range carcass can feel firm and you are paying for capacity you will not use. There is also nothing fancy about the cosmetics. The sidewall is functional and plain, so if you want a tire that dresses up the trailer you will be disappointed. But for the core job of carrying weight and surviving heat, this is the one we trust first.
- Full nylon overlay across the belt package to resist heat and tread separation at sustained highway speed
- Optimized tread depth and shoulder design for even wear and long mileage on tandem-axle trailers
- Load Range D rating handles heavier travel trailers and dual-axle setups with margin to spare
Pros: Strong reputation for heat resistance and long tread life among trailer owners; Smooth radial ride that tracks straight with minimal sway behind the tow vehicle; Wide availability so matching a set or replacing one is easy
Cons: Load Range D may be more tire than light single-axle pop-ups actually need; Sidewall lettering and finish are plain compared to premium-look tires
2. Maxxis M8008 ST Radial ST225/75R15 Load Range E: Best for Heavy Loads
When the trailer is genuinely heavy, the Maxxis M8008 is the tire enthusiasts reach for. The double steel belt package combined with a nylon overlay creates a casing that shrugs off pothole impacts and road debris that would gash a lesser tire, and the Load Range E rating gives you up to 2830 pounds per tire. For loaded fifth wheels, toy haulers, and heavily packed travel trailers running this size, that extra margin is exactly what keeps a hot summer haul from ending in a blowout. Owners who tow long distances repeatedly praise how the casing stays cool and the tread wears flat across its full width.
The flip side of all that strength is ride quality on lighter rigs. Put an E-range M8008 under a trailer that only needs a C or D, and the stiff carcass transmits more road harshness and can make the trailer feel like it is bouncing rather than soaking up bumps. It is also a noticeably heavy tire, so mounting and balancing takes a little more muscle. Match it to a heavy load and it is superb. Put it on a featherweight trailer and you are carrying weight and stiffness you do not need.
- Double steel belt construction with a full nylon cap ply for maximum heat and impact resistance
- Load Range E rating delivers one of the highest capacities available in the 225/75R15 size
- Deep tread and reinforced shoulder built for long-distance highway towing
Pros: Highest load capacity in this list, ideal for heavy fifth wheels and toy haulers; Excellent reputation for sidewall strength and resistance to road hazard damage; Holds pressure and shape well even under near-maximum load
Cons: Load Range E is overkill and rides stiff on lighter trailers; Heavier tire that can be a bit more effort to mount and balance
3. Goodyear Endurance ST225/75R15 Load Range D: Best Premium Pick
The Goodyear Endurance is what you buy when you want a name you recognize on a tire you depend on. Goodyear engineered this line specifically for trailers rather than adapting a passenger casing, and the Durawall sidewall technology is a genuinely useful touch for RV owners who back into tight campsites and curb their tires more than they would like. The made-in-USA construction shows up as tight consistency from one tire to the next, so a matched set behaves the same on every corner of the trailer. Owners report excellent resistance to the weather cracking that ages out cheaper trailer tires before the tread ever wears down.
The honest catch is value positioning. This is a premium tire and it asks a premium relative to capable budget options like the Carlisle, so the question is whether the brand confidence and sidewall tech are worth it to you. And like our top pick, this is a Load Range D, so the heaviest toy haulers will still want the E-range Maxxis. For a typical travel trailer owner who tows often and wants reassurance, though, the Endurance delivers exactly the dependability the name promises.
- Durawall technology adds sidewall scuff and curb resistance for tires that get parked tight
- Built in the USA with a heavy-duty casing engineered specifically for trailer duty
- Decoupling groove in the shoulder helps reduce irregular wear on tandem axles
Pros: Premium brand quality control and consistent build from tire to tire; Strong sidewall durability that resists curbing and weather cracking; Trusted name with a solid track record for long-haul reliability
Cons: Sits at a higher price point than budget trailer tires in the same size; Load Range D limits it for the very heaviest fifth-wheel applications
4. Trailer King ST Radial II ST225/75R15 Load Range D: Best Value
The Trailer King ST Radial II is the smart-money choice for owners who want the right construction without paying for a marquee name. The important parts are all here, a steel-belted radial casing with a full nylon overlay and a Load Range D rating that matches the heavy hitters at 2540 pounds per tire. In daily towing it tracks straight, rides comfortably for a D-range tire, and the nylon cap gives it the heat margin that separates a reliable trailer tire from a roadside headache. For a second trailer, a seasonal hauler, or anyone replacing a full set at once, the value here is hard to argue with.
Where it gives a little back is at the high end of longevity. Tread life is perfectly respectable, but it does not quite match the premium Goodyear or the heat endurance of the Carlisle over many seasons, and owners who rack up serious annual mileage may rotate through these a bit sooner. The brand also lacks the household recognition of the bigger names, which is a non-issue mechanically but does affect resale and reassurance for some. As a do-the-job tire at a friendly value, it is an easy recommendation.
- Full nylon overlay over steel belts for added high-speed heat durability
- Center groove and shoulder design tuned for straight tracking and even wear
- Load Range D capacity at a notably accessible value point for the size
Pros: Strong capability for the value, a lot of tire without a premium outlay; Solid heat handling thanks to the nylon cap construction; Tracks straight and rides comfortably on typical travel trailers
Cons: Tread life is good but not class leading compared to premium options; Brand recognition is lower, which matters to some buyers
5. Freestar M-108+ ST225/75R15 Load Range E: Best High-Capacity Value
The Freestar M-108+ fills a specific gap, owners who genuinely need Load Range E capacity in 225/75R15 but do not want to pay top dollar for it. With twin steel belts, a nylon overlay, and a 2830 pound per tire rating, it brings serious load capability to heavier travel trailers and lighter fifth wheels. For someone hauling near the limits of this size who is replacing all four or six tires at once, the combination of high capacity and friendly value adds up fast, and the deep tread gives it solid mileage potential on long highway runs.
The trade-off shows up in consistency. This is a value E-range tire, and owners occasionally report a tire that needs a little extra balancing weight or runs slightly less uniform than a premium counterpart, so it pays to have a good tire shop mount and balance the set carefully. As with any E-range tire, the stiff carcass also rides firm on lighter trailers, so reserve it for rigs that actually use the capacity. Within that lane, it offers a lot of load rating for the money.
- Load Range E capacity at a value price, rare combination in the 225/75R15 size
- Twin steel belts plus nylon overlay for heat resistance under heavy load
- Deep tread pattern engineered for long highway mileage on loaded trailers
Pros: High 2830 lb load rating without a premium price tag; Sturdy casing that handles heavy travel trailers and small fifth wheels; Good value for owners who need E-range capacity on a budget
Cons: Build consistency is slightly less uniform than premium brands; Stiff E-range ride is firm on lighter trailers
6. Transeagle ST Radial II ST225/75R15 Load Range E: Toughest Sidewall
The Transeagle ST Radial II earns its place on the strength of its sidewall. RV owners spend a surprising amount of tire grief on curbed and scuffed sidewalls from backing into tight sites, and the molded scuff-guard rib here takes that abuse and protects the casing underneath. Pair that with Load Range E construction, a 2830 pound rating, and a compound formulated to shed heat, and you have a tough, high-capacity tire for owners who tow heavy and park in cramped campgrounds. Reports from owners running these on loaded tandem-axle trailers point to a casing that holds up well across hot summer mileage.
The honest limitation is the brand footprint. Transeagle is not a name most tire shops stock on the shelf, so if you damage one on the road, sourcing a matching replacement quickly can be a challenge compared to a Goodyear or Carlisle. It also carries the usual E-range penalties of a firm ride and extra weight, which only make sense on a genuinely heavy trailer. If sidewall toughness on a heavy rig is your priority and you plan replacements ahead rather than relying on roadside availability, it is a strong, rugged option.
- Scuff-guard sidewall rib protects against curb and campsite damage
- Load Range E construction with heat-resistant compound for sustained highway towing
- Reinforced bead and casing built to carry heavy loads over the long haul
Pros: Very durable sidewall that resists curbing and road hazards; High load capacity suited to heavy trailers and fifth wheels; Compound tuned to run cool under load
Cons: Lesser-known brand with limited dealer support in some areas; Firm ride and added weight typical of E-range tires
7. Wanda Journey ST225/75R15 Load Range D: Best Budget Set
The Wanda Journey is the entry point for owners who need to get a trailer rolling on fresh rubber without a large outlay, and for that mission it does the job. It is a steel-belted radial with a Load Range D rating at 2540 pounds per tire, an 81 mph speed rating, and tracking that holds straight enough for light and moderate towing. For a utility trailer, a seasonal camper that sees limited miles, or a backup set, buying a full value set of these is a practical way to replace aging tires before they crack and fail. Within its intended duty cycle, it carries the load and gets you down the road.
The realistic caution is that this is a budget tire and it behaves like one over the long term. Tread life and heat endurance do not match the Carlisle, Goodyear, or Maxxis, so these reward conservative highway speeds, proper inflation, and not pushing hot mileage day after day. Owners who tow long distances frequently will get more total value from a mid-tier tire that lasts more seasons. But for light-duty trailers and budget-minded owners who maintain pressure and drive sensibly, the Wanda Journey is honest value.
- Steel-belted radial casing rated to Load Range D capacity for typical trailers
- 81 mph speed rating suitable for normal highway towing speeds
- Often sold in value sets, convenient for replacing all tires at once
Pros: Among the friendliest value options for outfitting a full trailer; Adequate 2540 lb capacity for most common dual-axle travel trailers; Reasonable straight-line tracking for light towing duty
Cons: Tread life and heat endurance trail the premium and mid-tier tires; Best kept to moderate mileage and conservative highway speeds
Frequently Asked Questions
What does the 225/75R15 size mean on an RV or trailer tire?
The numbers describe the tire dimensions and construction. The 225 is the section width in millimeters, the 75 is the aspect ratio, meaning the sidewall height is 75 percent of the width, the R indicates radial construction, and the 15 is the wheel diameter in inches. On a trailer tire you will also see the ST prefix, which stands for Special Trailer. ST tires have stiffer sidewalls than passenger or light truck tires of the same size because they are designed to carry vertical load and resist sway, not to steer or grip. Always replace an ST tire with another ST tire in the same size unless you have specifically had your trailer re-rated for a different fitment.
What load range do I need for my travel trailer in 225/75R15?
Match the load range to your trailer’s loaded weight, not its empty weight. Add the gross weight of the trailer fully packed, divide by the number of tires, and pick a tire whose per-tire capacity comfortably exceeds that number. In 225/75R15, Load Range C carries roughly 2150 pounds per tire, Load Range D around 2540 pounds, and Load Range E up to 2830 pounds. Most dual-axle travel trailers are well served by Load Range D, while heavy fifth wheels, toy haulers, and trailers loaded near their limit benefit from Load Range E. Leaving a margin of at least 10 to 20 percent above your real loaded weight is the single best thing you can do to prevent a blowout.
How long do RV trailer tires last, and when should I replace them?
Trailer tires usually age out before they wear out. Because RVs sit parked for long stretches, the rubber degrades from sunlight, ozone, and heat cycling more than from tread wear, so most experts recommend replacing ST tires every three to five years regardless of how much tread remains. Check the four-digit DOT date code on the sidewall to find the week and year of manufacture, and inspect for sidewall cracking, bulges, or flat spots from sitting. Buying tires that were manufactured recently matters, so look at that date code on any new set before mounting. Proper inflation and covering the tires when parked both meaningfully extend their usable life.
Can I use passenger or light truck tires instead of ST tires on my trailer?
It is generally not recommended without re-rating the trailer. ST tires are engineered with stiffer, stronger sidewalls specifically to handle the heavy vertical loads and lateral forces of towing, which helps control sway and resist the heat buildup of carrying weight at speed. A passenger or light truck tire of the same size has more flexible sidewalls tuned for ride comfort and steering, and using one can increase sway and reduce the effective load capacity. If you want to move away from ST tires, consult the trailer manufacturer or a qualified tire shop to confirm a properly rated light truck alternative and the correct inflation, rather than swapping on your own.
What tire pressure should I run in 225/75R15 trailer tires?
Run the maximum pressure stamped on the sidewall when the tire is cold, unless your trailer’s certification label specifies a lower figure for your load. Trailer tires are designed to carry their rated load at their rated pressure, and under-inflation is the leading cause of trailer tire failure because it lets the tire flex, overheat, and come apart. Check pressure before every trip while the tires are cold, since heat from driving raises the reading and gives a false high number. A simple tire pressure monitoring system on each trailer wheel is one of the best upgrades an RV owner can make, because it warns you of a slow leak or rising heat before it becomes a roadside blowout.
Our Verdict
For most RV and trailer owners running 225/75R15, the Carlisle Radial Trail HD is our top pick, blending strong heat resistance, even tread wear, a sensible Load Range D capacity, and wide availability into the most dependable all-around package in this size. If your trailer is genuinely heavy, the Maxxis M8008 in Load Range E is the runner up and the better choice, adding double steel belts and a higher load rating that give loaded fifth wheels and toy haulers the margin they need. Match the load range to your real loaded weight, buy tires with a fresh date code, keep them inflated to spec, and any of these will carry you down the road with confidence.
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