I understand that the 450/475-16 FIRESTONE BLACKWALL tires from Coker are out of round and have had other problems. While Coker has stood behind the problem I wonder if the 500/525-16 FIRESTONE BLACKWALL or the 600-16 FIRESTONE BLACKWALL tires have similar problems? While they make good with other tires that have the same problems I don't want to get into a continual tire swapping mode and I don't want to use radials. Other experiences? Thanks.