[busterbrown]

First, trailer tires have a load range based on a specific pressure (PSI), not speed (MPH). There is a speed rating for tires but that is determined by the manufacturer and is mutually exclusive of load range.

Remember, load range is is the amount of weight that a tire can support at a specific pressure, usually a "maximum inflation pressure". The wheels obviously have to support that pressure and weight as well.

If your OEM Dexstar wheels are LRE in size ST225/75r15, an LRE tire from Carlisle (in the same size) with a load range of "E" would be appropriately equivalent. The speed at which the tire is "rated" for may be different per the manufacturer.