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Load Range. Every tire has a load range, and trailer tires are no different. Marked on the sidewall, the load range runs from the lightest weight the tire can carry (Load Range B) to the heaviest (Load Range E). Load range is a measure of an individual tire's maximum capacity to carry a boat and trailer.
Standard load P-metric will not show a load range but rather a load index like a passenger tire. Extra load P-Metric will be identified with an XL, as in P235/75R15XL. Light truck (LT) and flotation tires have their load range listed with a letter, as in LT235/85R16/E or 31x10.50R15/C.