anybody know if a "C" rated tire will last any longer than a "B" rated tire. i need to replace the tires on a small trailer. load capacity is not a question. "B" rated tires are more than adequate. "C" rated tires only cost a few dollars more so i have been wondering if i could get a couple more years life out of a "C" tire than a "B" tire. like a lot of trailers the tires on this one die of old age before wear. if i could change them out at 6 years instead of 4 years in the long run they would be cheaper.