I just got a 08' titan a couple months ago and the tires were already cupping on the front tires. I took it into the dealer ship (baker jackson nissan) and they got me a set of tires for the front and blamed it on the tow. SOO I had new tires and less than 500 miles later. the front AND the rear tires are cupping.. they told me its due to heavy truck.?!? I have goodyear wrangler tires on there.. has anyone else been having the same problem?