From what I have observed over the years with my trailers and tires . My equipment trailers that I run at about 50% of capacity on local roads 35 to 50 mph , no problems with ST tires . My larger equip trailers and RV , when I had ST tires , lots of blow outs and tread seperation incidents , running at 90% of capacity and highway driving 60 to 75 mph . Switched to LT tires on heavy trailers and havent had a problem . I believe this is due to having 2000 lbs of extra capacity , and a higher speed rating .
NO TIRE is going to hold up constantly running at 90% capacity and at 95% of its speed rating in hot weather . Thats where I believe the problem lies with the ST trailer tire , on a travel trailer they are being run to their MAXIMUM or over for hours on end . Man made it , its gonna break , not if , its when .
