I had two blow outs within 5000 miles of each other. They were Karrier tires supposedly 8 ply (1600 rated) and both went out at doing 60 mph. They were on 13 inch rims and the trailer dropped quickly but handled OK as I came to rolling stop. The rims were bent to hell. Fortunately Walmart had my size but only in 6 ply rating (1360 lb rating). They seem to be holding up better then the Karrier 8 ply tires and they have a much lower load rating. I wonder if I got a bad batch because they both blew out within 5000 miles of each other on an 8000 miles trip.