Usually zipper or sidewall blowout are from old tires 7+ years or low tire pressure, I've seen all brands come unglued (50 years) and the folks having a problem have an overweight coach or never check tire pressure. Even watched a fella blow up his new rig when his wife lit the stove for warm danish right next to the fridge that was taken out and the propane line not capped, dealer warned them, didn't have a plug for the line, they said oh we won't use the propane anyway, just going to Orlando for the weekend.
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