general problems of the 2007 Ford F-350

Michelin tires dry rotting and cracking 4 years old, similar tires relled by michelin but not mine.

Federal couragia m/t lt265/70r17e tires purchased jan2013. Two tires had belt separate in may2014. The first two tires were replaced by my local tire shop. Another tire suffered complete tread separation on june2014. The local tire shop assured me that they will also replace the tire that came apart and asked me to provide body estimates to repair the damage caused by the tire so they can submit them to tire distributor. The tires have approx. 15,000 miles on them. These tires are installed on a 2007 Ford F-350 4x4 with a 5. 4l gas engine. The tires are peeling off as if they were recapped tires but they are not recaps.