Let me say up front that I have not bought tires from any other place than Discount Tire since 1971.  My experiance today is just another example of why I only buy from Discount Tire.  Yesterday (9/14/20) I took my Ford F350 Super Duty dually truck to my local Discount Tire for their free tire rotation.  As a part of their free service, Discount Tire checks the age and condition of my tires including the spare mounted under the bed of the truck.  The tires were bought in 2013 and still had plenty of good tread.  Christopher, the Discount Tire employee noticed some weather cracking on the tires, some tires worse than others.My spare tire was older and beyond service age.I made the decision to buy six new Michelin tires LT235/85 R16 which needed to be ordered and would be installed the next day (9/15/20 Today). I would take one of the older tires and use it as my spare.NOW, here comes the motivation for me to make this Five-star lengthly review.While Discount Tire was mounting my new tires, they noticed one of my inside dually tires had a bad tread separation, which Christopher indicated would be covered 100% by the tire warantee.  Christopher ordered another tire for me AT NO COST that will be my new spare.I normally carry a 2-ton in-bed Lance Camper in the bed of my F350.  If one of the inside dually tires would have blown it could have easily taken its neighbor tire with it, thereby put my wife and my life at great risk.  THANK YOU CHRISTOPHER AND DISCOUNT TIRE!This is just another reason why I only buy tires from Discount Tire.