Choose a trailer tire whose load rating, multiplied by the number of tires, comfortably exceeds your loaded trailer weight — then match the size on your current sidewall. For off-road campers, load range and construction matter more than brand: you want enough load capacity, the right size code, and a tougher LT or all-terrain casing for rough tracks. This guide decodes the sidewall and helps you choose.
Step 1 — Read your current sidewall
Your existing tire's sidewall gives you the size and ratings to match or improve. Example: 235/75R15 load range D — section width 235mm, 75% aspect ratio, 15" rim, load range D. Match the size; you can move up a load range for more capacity. This is the same size as our factory-fit 15-inch off-road tires (235/75R15).
Step 2 — Load range & capacity
Each tire lists a maximum load. Total tire capacity (per-tire load × number of tires) must exceed your loaded trailer weight with margin. Higher load ranges (C, D, E) carry more and run higher pressure — important for heavy off-road campers.
| Load range | Relative capacity | Typical use |
|---|---|---|
| C | Lighter | Small trailers |
| D | Medium | Mid off-road campers |
| E | Heavy | Large / heavily-loaded rigs |
Step 3 — ST vs LT vs all-terrain
- ST (Special Trailer): built for trailer duty — stiffer sidewalls, designed for towing, not steering.
- LT (Light Truck): tougher casing and tread options; popular for off-road campers that see rough terrain, where ST tires can be too fragile.
- All-terrain tread: better grip and puncture resistance on dirt/rock; check load rating still meets your weight.
Many serious off-road camper owners fit LT/all-terrain tires for durability on tracks — just confirm the load rating covers your trailer weight. For rocky and gravel work, an all-terrain off-road tire balances grip and puncture resistance; for soft mud and sand, a mud-terrain tire clears better. Larger rigs running 16-inch wheels can step up to the 265/75R16 off-road tire.
Step 4 — Don't forget age, pressure & spare
- Age: trailer tires often age out before they wear out — check the date code and replace ~5–6 years regardless of tread.
- Pressure: run the pressure for your load, not just the max on the sidewall.
- Spare: carry a matching spare for remote travel.
FAQ
What does load range D mean on a trailer tire?
It indicates the tire's load/pressure capability — D carries more than C and runs higher pressure. Match or exceed your loaded trailer weight across all tires.
Can I put LT tires on my off-road trailer?
Often yes, and many off-road owners do for durability — just confirm the LT tire's load rating meets your trailer's weight at its rated pressure.
How do I read the tire size?
Format like 235/75R15: width (mm) / aspect ratio (%) / radial / rim diameter (in). Match this to your current tire unless you're deliberately resizing.
How often should I replace trailer tires?
Trailer tires commonly age out in about 5–6 years even with good tread — check the date code and inspect for cracking.
Matching wheels too? See our trailer wheel bolt pattern guide.
Find the right tires: shop brakes, suspension, tires & wheels — in stock, ships from Upland, CA.