I seriously doubt it's covered. Even with the Nissan extended warranties.

The only time you get a warantee like that is if you get aftermarket tires on your vehicle and specifically get one. Even then, I'm not so sure off-roading damage is covered.

Flats due to road hazards and defective materials and workmanship, maybe...

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01 SE 6cyl 5spd Solar Yellow
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Modified 2001 SE 6cyl 5spd 4x4 Solar Yellow
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