One comment about old tires. We really don't know why the tire let go, so there are a lot of assumptions made. Steel belted tires normally fail due to tread separation. On the 3 motorhome tires that I have had blow, all of them gave a small warning before they let loose. The tread began to separate, which caused a small amount of vibration first. The vibration went from noticeable to really bad just before the tire let go. It would useful to know if it was tread separation and if there was a warning vibration first.