Speed is definitely an issue with trailer tires. One of the problems with my trailer is that the load range of my four tires was exactly the same as my loaded trailer. Each axel was rated at 3,500 lbs. The two tires on one axel had a load capacity of 3,500. The loaded weight of the trailer was 7,000. Two axles = 7,000. There simply was no margin of error. The Samson tires continuously lost air. So under inflation may have been a factor in the blowout.