Problems with 2007 Nissan Frontier WHEELS

My frontier had a flat tire and when my spare tire was lowered, there were 4 spots of the tire that had been worn through the side wall. i tried another tire from a 2011 frontier and the tire was the same exact way. the way its mounted is the problem. *tr

My vehicle has the low tire air pressure sensor. all 4 of the tires leak because the valve stems are cracking internally. the valve stems are $100 each plus labor to install them. soft tires are unsafe and could blow out causing accidents and injury. these should be recalled. nissan says they won't help. *tr

On 01-13-2011 i was driving my 2007 nissan frontier pick up on pa sr 92s. between nicholson and tunkhannock abs and slip warning lights came on. i called my nissan dealer immediately, explained the problem and difficulties i had handling the vehicle on the snow covered road. i was told that earliest appointment i could get was 01-20-2011. on my way back, when i drove on another snowy road i applied 4x4 system but it failed to engage. now the abs, slip and 4x4 did not work and i had hard times to make it safely home. i called the dealer again a was again told that i could get it fixed on 01-20-2011. i decided to report this problem and i hope that your investigation of my complain will make driving, especially winter driving of nissan vehicles safer. *tr

Purchased 2007 nissan frontier crew cab p/u truck from bondy's nissan, dothan, alabama in january 2007, new - in january 2008 i rotated tires on truck, including the spare wheel, which has a matching tire, same as four on the ground - the low tire pressure sensor light came on - i took the truck to service department of bondy's nissan to determine why sensor light was on - service rep told me the steel wheel that came with truck as "spare" was cause for the sensor to come on - he said they would not do anything to correct the problem - said i would have to take it up with nissan usa - have emailed nissan-usa, but no response from them, yet. *tr