There never seems to be enough info on how the tires lived their life....type of storage and time spent in sun with low pressure when not being used etc....
how they were backed by jackknifing them into a spot, etc....speeds they were driven and amount of weight they supported....owners operators of one vehicle only know the info needed if they have avidly research these web sites...and truly can only apply it to the set of tires they have on the vehicle that is solely operated by them, and even then on OEM tires you know what speed that delivery guy must have driven to get them to the dealer....so that's a 1000 mile or more of who knows what kind of treatment.....we all have been conditioned to do nothing to our car tires...which seem to last 35000 or more miles with no real care.....so it is hard to change that behavior when we start pulling a trailer....until BOOM occurs.....all I truly know is the OEM tires on my trailer have traveled 10000 miles at 56-58 mph with 700 miles done by an unknown delivery guy.....in two years since delivery of new 5 er....they look today like the day they were delivered to me and even have some of the nubs that come on new tires....they were nitrogen filled....including the spare....never more than 2 lbs below or 3 lbs above max allow CTP ...never jackknifed always keep rolling with minimal side load....course we don t know how the guy at the RV repair shop backs our rig.....and who knows how much pressure can be put on x chocks when DW complains of trailer rocking around..
Make sure you let the installer of your new tires know that you will not accept ones that are more than 6 months old....since the max life under good conditions of an ST Tire is 5 yrs whether it is in the warehouse or on your trailer....that new tire you just got can be several years old if you don't ck date....good luck to all with the adventure of trailer tires....I hope I never have to post here that mine had an issue.....so far so good....