I am doing tire research for a replacement of our original Marathons later this year, and came across this thread. Our 3326 is not moving right now, we use it in a campground so I will replace the tires later.
A tire blowout on a dual wheel trailer, in my opinion, carries the same risk as a single for equipment damage. Tire tread can and will be kicked up by the rear tire even if the front is the failed location. Watch a semi blow a tire from a safe distance and the tread will often be kicked up by the rear tires.
This is why I decided to install a safety cage on our plumbing. It was a one time investment that gives us peace of mind to deflect any road hazards, not just blown tires.
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