Both work, but the right choice depends on your setup and payload.

• Capacity needs: Load range E typically supports higher loads and higher max inflation than load range D. Choose the range that meets or exceeds your trailer’s required capacity.
• Match your hardware: Never exceed your trailer’s axle, hub, or wheel ratings. Up-rating tires alone doesn’t raise those limits.
• Ride and weight: D-rated tires are often lighter and can feel less stiff when the trailer’s lightly loaded; E can offer more headroom for heavier cargo.
• Fitment: Many ST sizes on this page are load range D. Always verify size, load index, and load range on your trailer placard or owner’s manual.

On this page, many trailer tires labeled load range D are listed as “8 Ply” or “8PR.”

• Ply rating vs plies: Ply rating is a strength class, not a literal layer count. An 8‑ply rating indicates a performance level comparable to older 8‑ply constructions, using modern materials.
• What to look for: Check the tire’s sidewall for load range (D), load index (e.g., 105/101), and speed symbol (e.g., N or M). Product titles on this page often show “8 Ply Load Range D.”
• Why it matters: Ply rating helps you gauge carrying capacity and recommended inflation range for the tire’s intended use.

Load range D is common for many trailer applications and some light‑duty trucks.

• Trailers: Utility, boat, small to midsize campers, and cargo trailers frequently use ST‑marked load range D tires in sizes like ST175/80R13, ST205/75R14, or ST205/75R15 (tire only, no rim).
• Light trucks/SUVs: Certain LT sizes are offered in load range D for specific off‑road or mixed‑use needs. Fitment depends on the vehicle’s placard.
• Always verify: Use your trailer or vehicle’s owner’s manual and tire placard to confirm the exact size, load index, and load range required.

Load range D can be a practical choice when it aligns with your towing weight and hardware.

• Within ratings: If your trailer’s required load capacity per tire is met by a D, it can be suitable for everyday towing.
• Balanced performance: D‑rated ST trailer tires offer a blend of strength and weight that works well for many small to midsize trailers.
• Check the details: Confirm the load index (e.g., 105/101) and speed symbol match your needs, and follow the sidewall’s inflation guidance without exceeding your wheel’s rating.
• If loads increase: Heavier cargo may point you toward a higher load range.

Each part of the marking tells you something important.

• ST: Special Trailer tire, intended for trailer use.
• 205/75: Section width (205 mm) and aspect ratio (75% of width).
• R14: Radial construction for a 14‑inch rim.
• Load range D: Indicates an 8‑ply rating class and higher load capability than C within the same size.
• Load index/speed: Numbers/letter (e.g., 105/101N) show capacity per tire and speed symbol.
• Notes on listings: “Tire only” means no wheel/rim included. Always match size, load range, and wheel specs to your trailer’s placard.