Trailer tires are designed with stronger sidewalls than an equivalent car one, which means less flex and less trailer sway

from side-to-side when going around corners or driving through cross-winds.

Trailer tire sizes are broken into main groups 12 inches and smaller and 13 inches and larger. Sizes 12 inches and smaller are generally listed by a two number size, such as 4.80-8 or 5.70-12. The first number in this size is the width of the tread, the second number is the size of the rim that it mounts on.

Trailer tires typically have C, D, or E load ranges. A load range 'C' tire, for example, is at its peak load capacity—possibly 1600 pounds—when it's inflated to its maximum pressure of 50 PSI. A load range 'C' tire at 25 PSI might be able to support a load of 990 pounds, while at 40 PSI, that capacity could be 1300 pounds.

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https://www.aulicetyre.com/trailer-tire.html