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actually i think they run intertubes, like in NASCAR, so if they do have a blow out, they will still have a few inches of rubber, so they can safely change in. Even with duals, if you have one go out, then you still have to pull over to change it because then the weight bearing tire on that axle may not be able to handle the added stress.
i don't really remember it all, i was exhausted when we even got to the show, so i'll have to call my more alert buddies on what they remembered about them.
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Randy
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